Rationally Speaking

Rationally Speaking Podcast

Rationally Speaking is the bi-weekly podcast of New York City Skeptics. Join host Julia Galef and guests as they explore the borderlands between reason and nonsense, likely from unlikely, and science from pseudoscience. Any topic is fair game as long as we can bring reason to bear upon it, with both a skeptical eye and a good dose of humor! We agree with the Marquis de Condorcet, who said that in an open society we ought to devote ourselves to "the tracking down of prejudices in the hiding places where priests, the schools, the government, and all long-established institutions had gathered and protected them."Rationally Speaking was co-created with Massimo Pigliucci, is produced by Benny Pollak, and is recorded in the heart of New York City's Greenwich Village.

Rationally Speaking #244 - Stephanie Lepp and Buster Benson on "Seeing other perspectives, with compassion"
This episode features a pair of interviews on a similar topic: First, Stephanie Lepp (host of the Reckonings podcast) discusses what she's learned from interviewing people who had a serious change of heart, or "reckoning," including a former Neo-nazi and a former sex offender. What causes a reckoning? Second, Buster Benson (author of Why Are We Yelling? The art of productive disagreement) shares his tips for coming away from a disagreement feeling more alive -- for example, don't just focus on the litera...

Rationally Speaking #243 - Bryan Caplan on "The Case for Open Borders"
The idea of open borders -- letting people move freely between countries, taking a job wherever they can find a job they want -- is still a pretty fringe position, politically speaking. But economist Bryan Caplan makes a compelling case for it in his new graphic nonfiction book, "Open Borders: The Science and Ethics of Immigration," illustrated by cartoonist Zach Weinersmith. In this episode, Julia questions Bryan about several aspects of his case....

Rationally Speaking #242 - Keith Frankish on "Why consciousness is an illusion"
Philosopher of mind Keith Frankish is one of the leading proponents of "illusionism," the theory that argues that your subjective experience -- i.e., the "what it is like" to be you -- is a trick of the mind. It's a counterintuitive theory, but Keith makes the case for it in this episode, while explaining the other leading theories of consciousness and why he rejects them....


Rationally Speaking #241 - Thibault Le Texier on "Debunking the Stanford Prison Experiment"
The Stanford Prison Experiment is one of the most famous psychology experiments in history. For decades, we've been told that it proves how regular people easily turn sadistic when they are asked to role play as prison guards. But the story now appears to be mostly fraudulent. Thibault Le Texier is a researcher who dug into the Stanford archives and learned that the "prison guards" were actually told how to behave in order to support the experimenters' thesis. On this episode, Thibault and Julia discuss his...

Rationally Speaking #240 - David Manheim on "Goodhart's Law and why metrics fail"
If you want to understand why things go wrong in business, government, education, psychology, AI, and more, you need to know Goodhart's Law: "When a measure becomes a target, it ceases to become a good measure." In this episode, decision theorist David Manheim explains the dynamics behind Goodhart's Law and some potential solutions to it....


Rationally Speaking #238 - Razib Khan on "Stuff I've Been Wrong About"
It's rare for public intellectuals to talk about things they've gotten wrong, but geneticist Razib Khan is an exception. He recently published list of 28 things he's changed his mind about in the last decade, not just in genetics, but in other fields of science, politics, society, and religion. Julia interviews Razib about some of the items on the list -- why did he change his mind, and what lessons does he feel he's learned from his past errors?...

Rationally Speaking #237 - Andy Przybylski on "Is screen time bad for you?"
It's common wisdom that spending a lot of time on your smartphone, or checking social media like Facebook and Twitter, takes a psychological toll. It makes us depressed, insecure, anxious, and isolated -- or so people say. But is there any research to back that up? Julia discusses the evidence with professor Andy Przybylski, director of research at the Oxford Internet Institute....

Rationally Speaking #236 - Alex Tabarrok on "Why are the Prices So D*mn High?"
Over the last two decades, the prices of consumer goods like toys and electronics have gone way down, but the prices of health care and education have gone up roughly 200%. Why? In this episode, economist Alex Tabarrok discusses his latest book, co-authored with Eric Heller, "Why are the Prices So D*mn High?," which blames rising costs on a phenomenon called the Baumol Effect....


Rationally Speaking #235 - Tage Rai on "Why people think their violence is morally justified"
We typically think of violence as being caused by a lack of control, or by selfish motives. But what if, more often than not, violence is intended to be morally righteous? That's the thesis of the book Virtuous Violence: Hurting and Killing to Create, Sustain, End, and Honor Social Relationships. Author Tage Rai debates his book's thesis with Julia. Plus: What does The Iliad teach us about changing attitudes about morality over time?...

Rationally Speaking #234 - Dylan Matthews on "Global poverty has fallen, but what should we conclude from that?"
The global poverty rate has fallen significantly over the last few decades. But there's a heated debate, between people like psychologist Steven Pinker and anthropologist Jason Hickel, over how to view that fact. Is it a triumph for capitalism? Should we celebrate it, or lament the fact that rich countries aren't doing more to close the poverty gap faster? Vox journalist Dylan Matthews explains the disagreement. He and Julia discuss the strengths and weaknesses of each side's argument....

Rationally Speaking #233 - Clive Thompson on "The culture of coding, and how it’s changing the world"
Technology writer Clive Thompson discusses his latest book, Coders: The Making of a New Tribe and the Remaking of the World. Topics Clive and Julia cover include: - Why coders love efficiency so much - Are there downsides to efficiency? - Do coders have particular blindspots when it comes to human nature? - What is a "10x Coder," and why do people disagree about whether they exist? - Does Clive still agree with his older book, "Smarter Than You Think," which argued that technology is making us smarter?...


Rationally Speaking #232 - Tyler Cowen on "Defending big business against its critics"
Economist Tyler Cowen discusses his latest book, "Big Business: A love-letter to an American anti-hero." Why has anti-capitalist sentiment increased recently, and to what extent is it justified? How much are corporations to blame for wage stagnation, climbing cost of living, or the slow response to climate change? Tyler and Julia also explore their various disagreements: on how to communicate, whether people should bet on their beliefs, and whether we should increase public optimism about technology....

Rationally Speaking #231 - Helen Toner on "Misconceptions about China and artificial intelligence"
Helen Toner, the director of strategy at Georgetown's Center for Security and Emerging Technology (CSET), shares her observations from the last few years of talking with AI scientists and policymakers in the US and China. Helen and Julia discuss, among other things: How do the views of Chinese and American AI scientists differ? How is media coverage of China misleading? Why the notion of an "AI arms race" is flawed Why measures of China's AI capabilities are overstated Reasons for optimism and pess...

Rationally Speaking #230 - Kelsey Piper on “Big picture journalism: covering the topics that matter in the long run”
This episode features journalist Kelsey Piper, blogger and journalist for "Future Perfect," a new site focused on topics that impact the long-term future of the world. Kelsey and Julia discuss some of her recent stories, including why people disagree about AI risk, and how she came up with her probabilistic predictions for 2018. They also discuss topics from Kelsey's personal blog, including why it's not necessarily a good idea to read articles you strongly disagree with, why "sovereignty" is such an import...


Rationally Speaking #229 - John Nerst on "Erisology, the study of disagreement"
This episode features John Nerst, data scientist and blogger at everythingstudies.com, discussing a potential new field called "erisology," the study of disagreement. John and Julia discuss why Twitter makes disagreement so hard; whether there's anything to learn from postmodernism; John's "signal and corrective" model that explains why disagreement persists even when people agree on the key facts; and how the concept of "decoupling" helps explains Sam Harris and Ezra Klein's debate last year about IQ....

Rationally Speaking #228 - William Gunn and Alex Holcombe on "Is Elsevier helping or hurting scientific progress?"
In the wake of the University of California's decision to end their contract with Elsevier, the world's largest scientific publisher, a lot of people have been talking about the effect that publishers like Elsevier have on the progress of science. William Gunn, director of scholarly communications for Elsevier, and Alex Holcombe, cognitive scientist and open science advocate, discuss their differing perspectives on the question. The discussion includes: What are scientists' main complaints about Elsevier? W...

Rationally Speaking #227 - Sarah Haider on "Dissent and free speech"
This episode features Sarah Haider, the president of Ex-Muslims of North America. Julia and Sarah discuss why it's important to talk about the challenges of leaving Islam, and why that makes people uncomfortable or angry. They also explore whether being intellectually honest helps or hurts your effectiveness as an activist; Sarah's concerns with the Intellectual Dark Web; and whether Sarah would draw any lines when it comes to giving offensive views a platform....


Rationally Speaking #226 - Rob Wiblin on "An updated view of the best ways to help humanity"
If you want to do as much good as possible with your career, what problems should you work on, and what jobs should you consider? This episode features Rob Wiblin, director of research for effective altruist organization 80,000 Hours, and the host of the 80,000 Hours podcast. Julia and Rob discuss how the career advice 80,000 Hours gives has changed over the years, and the biggest misconceptions about their views. Their conversation covers topics like: - Should everyone try to get a job in finance and d...

Rationally Speaking #225 - Neerav Kingsland on "The case for charter schools"
This episode features Neerav Kingsland, who helped rebuild New Orleans' public school system after Hurricane Katrina, converting it into the country's first nearly-100% charter school system. Neerav and Julia discuss: why Neerav believes the evidence shows charter schools work better than regular public schools, his responses to the main arguments against charters, and what we know about how parents choose schools for their children....

Rationally Speaking #224 - Rick Nevin on "The long-term effects of lead on crime"
This episode features Rick Nevin, an economist who is known for his research suggesting that lead is one of the main causes of crime. Rick and Julia discuss: how do we know the correlation between lead and crime is a sign of a causal relationship? Has the lead-crime theory made any successful predictions? And is it possible that getting rid of lead could reduce the crime rate down to zero?...


Rationally Speaking #223 - Chris Fraser on "The Mohists, ancient China's philosopher warriors"
Not enough people know about the Mohists, a strikingly modern group of Chinese philosophers active in 479-221 BCE. This episode features Chris Fraser, expert on Mohism and professor of philosophy at the University of Hong Kong. Chris and Julia discuss how the Mohists put their philosophy into practice and got Chinese leaders to hold off on starting wars; how their philosophy was similar to and different from modern consequentialism; why their movement died out, and what modern groups like Effective Altruist...

Rationally Speaking #222 - Spencer Greenberg and Seth Cottrell on "Ask a Mathematician, Ask a Physicist"
This episode features the hosts of "Ask a Mathematician, Ask a Physicist," a blog that grew out of a Burning Man booth in which a good-natured mathematician (Spencer Greenberg) and physicist (Seth Cottrell) answer people's questions about life, the universe, and everything. Spencer and Seth discuss the weirdest and most controversial questions they've answered, why math is fundamentally arbitrary, Seth's preferred alternative to the Many Worlds Interpretation of quantum physics, how a weird group of parapsy...

Rationally Speaking #221 - Rob Reich on "Is philanthropy bad for democracy?"
This episode features political scientist Rob Reich, author of "Just Giving: Why Philanthropy is Failing Democracy, and How it Can Do Better". Rob and Julia debate his criticisms of philanthropy: Does it deserve to be tax-deductible? Is it a violation of the autonomy of recipients to attach strings to their charitable gifts? And do philanthropists have too much power in society?...


Rationally Speaking #220 - Peter Eckersley on "Tough choices on privacy and artificial intelligence"
This episode features Peter Eckersley, an expert in law and computer science, who has worked with the Electronic Frontier Foundation and the Partnership on AI. Peter and Julia first delve into some of the most fundamental questions about privacy: What are the risks of losing privacy? Do we have more to fear from governments or industry? Which companies do a good job of protecting their users' privacy? Are there tradeoffs between supporting privacy and supporting competitive markets? Next, they discuss Peter...


Rationally Speaking #217 - Aviv Ovadya on "The problem of false, biased, and artificial news"
Aviv Ovadya, an expert on misinformation, talks with Julia about the multiple phenomena that get lumped together as "fake news." For example, articles that are straightforwardly false, misleading, or artificially created (think "Deepfakes," videos that make a politician appear to say something he didn't say). Which of those problems are more dangerous for our civilization? Are any of them tractable? And what might a solution look like?...

Rationally Speaking #216 - Diana Fleischman on "Being a transhumanist evolutionary psychologist"
On this episode of Rationally Speaking, professor Diana Fleischman makes the case for transhumanist evolutionary psychology: understanding our evolved drives, so that we can better overcome them. Diana and Julia discuss sexual preferences, jealousy, and other drives -- how immutable are they? How do we know? And how would it change society, if we could change the distribution of people we find attractive, or normalize new relationship structures such as polyamory?...


Rationally Speaking #214 - Anthony Aguirre on "Predicting the future of science and tech, with Metaculus"
This episode features physicist Anthony Aguirre discussing Metaculus, the site he created to crowd-source accurate predictions about science and technology. For example, will SpaceX land on Mars by 2030? Anthony and Julia discuss details such as: why it's useful to have predictions on questions like these, how to measure Metaculus' accuracy, why Anthony chose not to run it like a traditional prediction market, and how to design incentives to reward good forecasters....

Rationally Speaking #213 - Dean Simonton on "The causes of scientific and artistic genius"
This episode features Professor Dean Simonton, who has spent his life quantitatively studying geniuses, from Einstein to Mozart. Dean and Julia discuss his views on whether IQ is important, whether some innovations are "in the air" at given points in history, whether the "10,000 hours = mastery" theory promoted by Malcolm Gladwell is accurate, and more....

Rationally Speaking #212 - Ed Boyden on "How to invent game-changing technologies"
This episode features neuroscientist Ed Boyden discussing two inventions of his that have revolutionized neuroscience: optogenetics and expansion microscopy. Ed and Julia talk about Ed's approach to coming up with good ideas, why he prefers reading old science to new science, his big-picture plan for what he wants to solve in his career, and his take on the rationalist versus Hayekian debate over how to make important progress....


Rationally Speaking #211 - Sabine Hossenfelder on "The case against beauty in physics"
This episode features physicist Sabine Hossenfelder, author of Lost in Math, arguing that fundamental physics is too enamored of "beauty" as a criterion for evaluating theories of how the universe works. She and Julia discuss the three components of beauty (simplicity, naturalness, and elegance), why physicists think it's reasonable to put their trust in beauty, and why this might be merely a symptom of other underlying problems with physics as a discipline....

Rationally Speaking #210 - Stuart Ritchie on "Conceptual objections to IQ testing"
This episode features Stuart Ritchie, intelligence researcher and author of the book "Intelligence: All That Matters." Stuart responds to some of the most common conceptual objections to the science of IQ testing. Can we even define intelligence? Aren't there lots of different kinds of intelligence? How do we know the tests are measuring intelligence at all instead of something like motivation or familiarity with the style of testing? Does it undermine the meaningfulness of IQ as a metric that people can im...

Rationally Speaking #209 - Christopher Chabris on "Collective intelligence & the ethics of A/B tests"
This episode features cognitive psychologist Christopher Chabris discussing his research on "collective intelligence" -- why do some teams perform better than others at a wide variety of tasks? Julia discusses potential objections to the findings and how gender-related publication bias should affect our interpretation of them. In the second half of the episode, Julia and Chris discuss why people get so upset at companies like Facebook and OKCupid for doing experiments on their users, and whether that's fair...


Rationally Speaking #208 - Annie Duke on "Thinking in bets"
This episode features Annie Duke, former pro poker player and author of the book Thinking in Bets: Making Smarter Decisions When You Don't Have All the Facts. Julia and Annie debate why people tend to ignore the role of luck in their decisions, whether expressing uncertainty makes you seem weak, and how people end up engaging in "defensive decision-making," where they're not trying to make the best call so much as simply avoid being blamed for bad outcomes....

Rationally Speaking #207 - Alison Gopnik on "The wrong way to think about parenting, plus the downsides of modernity"
Developmental psychologist Alison Gopnik explains why modern parenting is too goal-oriented. Alison and Julia discuss whether anything parents do matters, whether kids should go to school, and how kids learn discipline if you don't force them to do things. They also discuss Alison's reservations about Steven Pinker's book Enlightenment Now, and her concerns about potential downsides of modernity....

Rationally Speaking #206 - Kal Turnbull on "Change My View"
When people argue on the internet, you never expect anyone to actually say "You know what, that's a good point, you've changed my view somewhat." But Change My View, a fast-growing subreddit founded by Kal Turnbull, is an exception to the rule. Julia and Kal discuss the culture of Change My View, what makes it such an oasis for reasonable discussion on the Internet, and what we've learned about what motivates people to change their minds or not....


Rationally Speaking #205 - Michael Webb on "Are ideas getting harder to find?"
This episode features economist Michael Webb, who recently co-authored a paper titled "Are ideas getting harder to find?" It demonstrates that the number of researchers it takes to produce a technological innovation has gone up dramatically over time. Michael and Julia discuss various possible explanations for why this is happening, along with several challenges to his paper....

Rationally Speaking #204 - Simine Vazire on "Reforming psychology, and self-awareness"
Simine Vazire is a professor of psychology, the author of the blog, "Sometimes I'm Wrong," and a major advocate for improving the field of psychology. She and Julia discuss several potential objections to Simine's goal, how to handle criticism, and Simine's psychology research on the question: How self-aware are people about the way they behave?...

Rationally Speaking #203 - Stephen Webb on "Where is Everybody? Solutions to the Fermi Paradox."
In 1950, the great physicist Enrico Fermi posed a question that people have been puzzling over ever since: Where is everybody? The universe has been around for billions of years, so why haven't we seen any signs of alien civilizations? This episode features physicist Stephen Webb, who describes some of the potential solutions to the puzzle. Stephen and Julia also discuss questions such as: What evidence have we gotten so far that helps us answer the Fermi problem? How do we estimate how rare/difficult it is...


Rationally Speaking #202 - Bryan Caplan on "The Case Against Education"
In this episode, economist Bryan Caplan argues that the main reason getting a college degree is valuable is because of signaling (i.e., it proves that you have traits that employers value, like conscientiousness and conformity), and not because college teaches you useful knowledge or skills. Julia proposes several potential challenges to Bryan's argument, and they discuss why it matters how much of education's value is signaling....

Rationally Speaking #201 - Ben Buchanan on "The Cybersecurity Dilemma"
The security dilemma is a classic problem in geopolitics: Often when one nation takes measures to protect itself from attack (like adding to their stockpile of missiles), other nations see that and worry it means the first nation is preparing to attack them, which leads to a dangerous feedback loop of escalation. In this episode, Ben Buchanan (postdoctoral fellow at Harvard studying cybersecurity and statecraft) explores how this dilemma plays out in the realm of cybersecurity: Why is the dilemma harder to ...

Rationally Speaking #200 - Timothy Lee on "How much should tech companies moderate speech?"
This episode features tech and policy journalist Timothy Lee, discussing a question that's increasingly in the spotlight: How much should tech companies be actively moderating their users' speech? For example, should Facebook be trying to fight fake news? Should Twitter ban bullying? Should Reddit ban subreddits that they consider hate speech? Timothy and Julia look at the question not just from the legal perspective, but also from the moral and strategic perspectives as well....


Rationally Speaking #199 - Jessica Flanigan on "Why people should have the right to self-medicate"
This episode features Jessica Flanigan, professor of normative and applied ethics, making the case that patients should have the right to take pharmaceutical drugs without needing to get a prescription from a doctor. Jessica and Julia discuss a series of related questions, such as: Should there be exceptions made for drugs that have negative repercussions on society as a whole? And what is the morally relevant difference between a doctor imposing treatment on someone without consent, and the government with...

Rationally Speaking #198 - Timur Kuran on "Private Truths and Public Lies"
In this episode, economist Timur Kuran explains the ubiquitous phenomenon of "preference falsification" -- in which people claim to support something publicly even though they don't support it privately -- and describes its harmful effects on society. He and Julia explore questions like: Is preference falsification all bad? Are there ways to reduce it? And how much has the Internet changed the dynamics around preference falsification?...

Rationally Speaking #197 - Doug Hubbard on "Why people think some things can’t be quantified (and why they’re wrong)"
In this episode Julia talks with Doug Hubbard, author of How to Measure Anything, about why people so often believe things are impossible to quantify like "innovation" or "quality of life." For example, because people often have a deep misunderstanding of the meaning of probability. Or because they're reluctant to violate "sacred taboos" by putting a number on something like the value of human life. Or because it feels vulgar to "reduce" important things to a number. Doug explains how he responds to these o...


Rationally Speaking #196 - Eric Schwitzgebel on "Weird ideas and opaque minds"
Philosopher Eric Schwitzgebel returns to the show to explore several related questions: His taxonomy of the three different styles of thinker -- "Truth," "Dare," and "Wonder" -- and whether one of them is better than the others. His case for why it's bad to interpret people "charitably." And his seemingly paradoxical claim that we are frequently wrong about our own conscious experience....

Rationally Speaking #195 - Zach Weinersmith on "Emerging technologies that'll improve and/or ruin everything"
This episode features Zach Weinersmith, creator of the philosophical webcomic Saturday Morning Breakfast Cereal, and the co-author (with his wife Kelly Weinersmith) of the new book Soonish: 10 Emerging Technologies That'll Improve and/or Ruin Everything. Julia and Zach talk about which new technology is the most likely to happen, which would be most transformative, and which would pose the most risk to the world. Also, has our society become too risk-averse? And what are the main bottlenecks to technologica...

Rationally Speaking #194 - Robert Wright on "Why Buddhism is True"
This episode features bestselling author Robert Wright making the case for why Buddhism was right about human nature: its diagnosis that our suffering is mainly due to a failure to see reality clearly, and its prescription that meditation can help us see more clearly. Robert and Julia discuss whether it's suspicious that a religion turned out to be "right" about human nature, what it means for emotions to be true or false, and whether there are downsides to enlightenment....


Rationally Speaking #193 - Eric Jonas on "Could a neuroscientist understand a microprocessor?"
The field of neuroscience has been collecting more and more data, and developing increasingly advanced technological tools in its race to understand how the brain works. But can those data and tools ever yield true understanding? This episode features neuroscientist and computer scientist Eric Jonas, discussing his provocative paper titled "Could a Neuroscientist Understand a Microprocessor?" in which he applied state-of-the-art neuroscience tools, like lesion analysis, to a computer chip. By applying neuro...

Rationally Speaking #192 - Jesse Singal on “The problems with implicit bias tests”
You may have heard of the Implicit Associations Test (IAT) -- one of the most famous instruments from social psychology, it's frequently cited as evidence that most people harbor implicit racism or sexism, even if they aren't aware of it. This episode features science journalist Jesse Singal, who argues that the IAT has been massively overhyped, and that in fact there's little evidence that it's measuring real-life bias. Jesse and Julia discuss how to interpret the IAT, why it became so popular, and why it'...

Rationally Speaking #191 - Seth Stephens-Davidowitz on "What the internet can tell us about human nature" (Fixed)
There are a lot of sensitive topics about human nature that would be interesting to study, such as people's sexual behavior, or how racist people really are. Researchers studying those questions have always faced the problem that we tend to lie on surveys -- but we don't lie to Google. This episode features Seth Stephens-Davidowitz, economist and data scientist, and author of the book Everybody Lies: Big Data, New Data, and What the Internet Can Tell Us About Who We Really Are. Seth and Julia discuss the in...


Rationally Speaking #190 - Amanda Askell on "Pascal's Wager and other low risks with high stakes"
You've probably heard of Pascal's Wager: That it's rational to believe in God, because if you're wrong it's no big deal, but if you're right then the payoff is huge. This episode features philosopher Amanda Askell, who (though not religious herself) argues that it's much trickier to rebut Pascal's Wager than most people think. Amanda and Julia also discuss how to handle other decisions where a risk has very low probability but would matter a lot if it came true -- should you round them down to zero? Does it...

Rationally Speaking #189 - Stephan Guyenet on "What causes obesity?"
In this episode Julia sits down with neuroscientist and obesity researcher Stephan Guyenet, to talk about what scientists know so far about the causes of obesity, and in particular the brain's role in regulating weight gain. Julia and Stephan cover questions such as: Why did obesity start to increase in the United States in the latter half of the 20th century? Does the body have a "set point" of fat that it tries to defend, and what affects those set points? Are low-carb diets more effective for weight loss...

Rationally Speaking #188 - Robert Kurzban on "Being strategically wrong"
In this episode, recorded live at the Northeast Conference on Science and Skepticism, Julia interviews evolutionary psychologist Rob Kurzban, author of "Why Everyone (Else) is a Hypocrite." Rob describes the "modular mind" hypothesis, and how it explains hypocrisy, self-deception, and other seemingly irrational features of human nature. Rob and Julia argue about how useful these kinds of "strategic wrongness" really are....


Rationally Speaking #187 - Jason Weeden on "Do people vote based on self-interest?"
What determines which policies a person votes for? Is it their personality, their upbringing, blind loyalty to their political party? Or is it self-interest -- people voting for policies that will benefit themselves and the groups they belong to? This episode features psychologist Jason Weeden, arguing that self-interest is a much bigger determinant of voter behavior than most political scientists think it is. Jason and Julia talk about why researchers disagree over this question, and what "self-interest" e...

Rationally Speaking #186 - Tania Lombrozo on "Why we evolved the urge to explain"
Humans have an innate urge to reach for explanations of the world around us. For example, "What caused this tragedy?" or "Why are some people successful?" This episode features psychologist and philosopher Tania Lombrozo, discussing her research on what purpose explanation serves -- i.e., why it helps us more than our brains just running prediction algorithms. Tania and Julia also discuss whether simple explanations are more likely to be true, and why we're drawn to teleological explanations (e.g., "Why doe...

Rationally Speaking #185 - Hans Noel on "The role of ideology in politics"
We're used to conflating political parties (Republican and Democrat) with political ideologies (conservative and liberal), but the two were very distinct only a few decades ago. In this episode of Rationally Speaking, Julia talks with political scientist Hans Noel about why the Democrats became the party of liberalism and the Republicans the party of conservatism, whether voters are hypocrites in the way they apply their ostensible ideology, and whether politicians are motivated by ideals or just self-inter...


Rationally Speaking #184 - Gregory Clark on "What caused the industrial revolution?"
Nothing changed the course of human history as much as the industrial revolution. Yet its cause is a mystery: Why did it occur in the late 1700s, and not sooner (or later)? Why did it occur in Britain, a relatively small and geographically isolated country, and not somewhere much bigger like China, or elsewhere in Northern Europe like the Netherlands? This episode features economic historian Gregory Clark, author of A Farewell to Alms and one of the leading scholars of the industrial revolution. Greg and Ju...

Rationally Speaking #183 - L. A. Paul on "Transformative Experiences"
What if you had the opportunity to become a vampire, irreversibly -- and everyone you knew who had become one said "It's utterly indescribable." Would you take the leap, not knowing what it would feel like, or how it would change your personality and values? That's an example of what philosopher L. A. Paul calls a "transformative experience," one that's especially hard to choose (or forgo) rationally, because of how unknowable it is and how it changes your very preferences. In this episode, she and Julia di...

Rationally Speaking #182 - Spencer Greenberg on "How online research can be faster, better, and more useful"
This episode features mathematician and social entrepreneur Spencer Greenberg, talking about how he's taking advantage of the Internet to improve the research process. Spencer and Julia explore topics such as: how the meaning of your research can change dramatically when you ask people *why* they gave the answers they did on your survey, how the sheer speed of online research can help us solve the p-hacking problem, and how to incentivize scientists to share their data and methods....


Rationally Speaking #181 - William MacAskill on "Moral Uncertainty"
This episode introduces "moral uncertainty," the idea that you shouldn't be overly confident in your moral judgments -- like whether it's okay to eat meat, for example, or whether it's okay to abort a baby. The episode's guest is Will MacAskill, a founder of the effective altruism movement and Oxford professor of philosophy. Julia and Will discuss how to take multiple moral systems into account when making a decision, and how to deal with "absolutist" theories that insist some actions have infinite badness,...

Rationally Speaking #180 - David Roodman on "The Worm Wars"
In this episode of Rationally Speaking, Julia talks with economics and public policy expert David Roodman about the "Worm Wars" in social science -- the debate over whether deworming pills are an effective way to fight poverty. Along the way they discuss how to analyze a study, the differences between economists and epidemiologists, and how to make high stakes decisions when all your evidence is flawed....


Rationally Speaking #178 - Tim Urban on "Trying to live well, as semi-rational animals"
This episode features Tim Urban, author of popular longform illustrated blog Wait But Why. Julia and Tim explore one of their common interests: the tension between the rational and irrational aspects of human nature. Is there any value in the "irrational" parts of us (such as Tim's colorfully named "instant gratification monkey" and "social approval mammoth")? And can recognizing that tension help us live better -- or are we stuck struggling between our animal and rational selves?...

Rationally Speaking #177 - Dylan Matthews on "The science and ethics of kidney donation"
If you're a healthy adult, should you donate one of your kidneys to a stranger? This episode features journalist Dylan Matthews, who donated his kidney last year. He and Julia discuss the clever design of "donor chains," how we should evaluate the science about whether kidney donation is safe, and whether we have an ethical obligation to donate....

Rationally Speaking #176 - Jason Brennan on "Against democracy"
Churchill famously called democracy "the worst system of government, except for all the others that have been tried." Could we do better? On this episode of Rationally Speaking, Julia chats with professor Jason Brennan, author of the book "Against Democracy," about his case for why democracy is flawed -- philosophically, morally, and empirically....


Rationally Speaking #175 - Chris Blattman on "Do sweatshops reduce poverty?"
This episode explores the economics and ethics of low-paying factories (which some might call "sweatshops") in Ethiopia. Do they make their workers better off, relative to those people's outside options? Professor Chris Blattman has run some well-designed randomized controlled trials exploring this question, and he discusses what surprised him and how he's updated his views from his research. Julia and Chris also discuss an innovative program to reduce crime in Liberia using cognitive behavioral therapy....

Rationally Speaking #174 - John Ioannidis on "What happened to Evidence-based medicine?"
Over the last two decades, the Evidence-Based Medicine (EBM) movement has transformed medical science, pushing doctors to rely less on intuition or "common wisdom" in choosing treatments, and more on evidence from studies. Sounds great -- but has EBM become a victim of its own success? This episode features John Ioannidis, Stanford professor of medicine, health and policy, and statistics, and author of the famous paper, "Why Most Published Research Findings are False." John and Julia discuss how EBM has bee...

Rationally Speaking #173 - Brendan Nyhan on "What can we learn from the election?"
Since Trump's surprising win in the 2016 presidential election, there's been a flurry of discussion about why things turned out this way. But which explanations are well-supported, and which are wrong (or simply rationalizations)? This episode features political scientist Brendan Nyhan, who talks with Julia about questions like: Were the polls and models wrong? If so, why? How surprised should we have been by Trump's win? And why didn't the markets react badly to it?...


Rationally Speaking #172 - Brian Nosek on "Why science needs openness"
There's a growing anxiety about the quality of scientific research, as a depressingly large fraction of articles fail to replicate. Could "openness" solve that problem? This episode features Brian Nosek, a professor of psychology and founder of the Center for Open Science. He and Julia discuss what openness means, some clever approaches to boosting openness, and whether openness could have any downsides (for example, in the cases of peer review or data sharing)....

Rationally Speaking #171 - Scott Aaronson on "The ethics and strategy of vote trading"
It can be pretty frustrating to live in a "safe" state during national elections, where the chance your vote will affect the overall results is practically zero. This episode, with professor Scott Aaronson, explores an unorthodox solution to the problem: "swapping" your vote with someone in a swing state who was going to vote for a third party candidate. Scott and Julia explore the game theory of vote swapping, and whether there are any ethical problems with it....

Rationally Speaking #170 - Will Wilkinson on "Social justice and political philosophy"
How did "social justice" come to mean what it does today? This episode features a chat with Will Wilkinson, a writer, political philosopher, and vice president of policy for the Niskanen Institute. Will and Julia discuss the libertarian reaction to social justice, whether or not social justice is a zero-sum game, and how the Internet exacerbates conflicts over social justice....


Rationally Speaking #169 - Owen Cotton-Barratt on "Thinking About Humanity's Far Future"
What can we do now to affect whether humanity is still around in 1000 years (and what life will be like then)? In this episode, Julia talks with Owen Cotton-Barratt, a mathematician at Oxford's Future of Humanity Institute. They cover questions like: Given our poor track record of forecasting, is there any point to speculating about the far future? And is it rational to prioritize current people over future people?...

Rationally Speaking #168 - Don Moore on "Overconfidence"
This episode features a chat with Don Moore, professor of management of organizations at the University of California Berkeley's Haas School of Business, and an expert in overconfidence. Don and Julia discuss the various forms of overconfidence, whether its upsides are big enough to outweigh its downsides, and what people mean when they insist "I think things are better than they really are."...

Rationally Speaking #167 - Samuel Arbesman on "Why technology is becoming too complex"
As the technology we rely on every day becomes increasingly sophisticated, it's getting to the point where it's too complicated to understand -- not just for individual users, but for any human at all. In this episode, Julia talks with complexity scientist Samuel Arbesman, about his new book Overcomplicated: Technology at the Limits of Comprehension, why these unprecedented levels of complexity might be dangerous, and what we should do about it....


Rationally Speaking #166 - Eric Schwitzgebel on "Why you should expect the truth to be crazy"
Some theories violate common sense so wildly that you want to just reject them out of hand. For example, "The United States is conscious," or "The most moral act would be to replace all living beings with an orgasmic blob." On the other hand, many theories in physics that sounded similarly crazy turned out to be very well-supported (think of quantum theory, or relativity). So what role should "common sense" play in evaluating new theories? This episode features a discussion with philosopher Eric Schwitzgebe...

Rationally Speaking #165 - Robert Frank on "Success and Luck"
If someone asks you, "What caused your success (in finance, your career, etc.)?" what probably comes to mind for you is a story about how you worked hard and made smart choices. Which is likely true -- but what you don't see are all the people who also worked hard and made smart choices, but didn't succeed because luck wasn't on their side. In this episode, Julia chats with professor of economics Robert Frank about his latest book, Success and Luck: The Myth of the Modern Meritocracy. They explore questi...

Rationally Speaking #164 - James Evans on "Using meta-knowledge to learn how science works"
Has science gotten slower over the years? Does the proliferation of jargon make it harder for scientists to collaborate? What unstated assumptions -- "ghost theories" -- are shaping our research without us even realizing it? In this episode of Rationally Speaking Julia talks with sociologist of science James Evans, who investigates questions like these using some clever data mining....


Rationally Speaking #163 - Gregg Caruso on "Free Will and Moral Responsibility"
If people don't have free will, then can we be held morally responsible for our actions? And what would happen to society if we were to collectively shed our belief in free will? In this episode Julia talks with philosopher Gregg Caruso, who advocates a position of "optimistic skepticism" on the topic. Skepticism because people don't have free will as a sense of moral responsibility, but optimistic because society would be better off if we accept that we do....

Rationally Speaking #162 - Sean Carroll on "Poetic Naturalism"
Naturalism is the stance that everything that exists in the universe arises from "natural" causes, of the sort observable by science -- not supernatural ones. It's practically a foundational tenet of skepticism. But does it imply that there can be no meaning, or purpose, or morality in the universe? This episode features physicist Sean Carroll, author of the recent bestseller The Big Picture: on the Origins of Life, Meaning and the Universe Itself. Sean and Julia talk about the new "ism" he introduces in...

Rationally Speaking #161 - Tom Griffiths and Brian Christian on "Algorithms to Live By"
Julia chats with the authors of Algorithms to Live By, about how to apply key algorithms from computer science to our real life problems. For example, deciding which apartment to rent, planning your career, and prioritizing your projects. In the process, they discuss the assumptions that underlie those algorithms (and what to do about the fact that those assumptions are inevitably violated by the messy real world), and why procrastination might actually be the right algorithm for the wrong problem....


Rationally Speaking #160 - Live at NECSS -- Jacob Appel on "Tackling bioethical dilemmas"
It's the annual live Rationally Speaking episode, taped at the Northeast Conference on Science and Skepticism in NYC! This year features returning guest Jacob Appel, a bioethicist (and lawyer, and psychiatrist). Jacob and Julia discuss various bioethical dilemmas, such as: How do you handle parents who want to withhold medical treatment from their child for religious reasons? Is it unethical for American doctors to test new medications in the third-world? And what kinds of principles does a bioethicist use ...

Rationally Speaking #159 - Colin Allen on "Do fish feel pain?"
In this episode Julia talks with philosopher of cognitive science Colin Allen about whether fish can feel pain. In the process they explore a cluster of related questions: Are fish conscious, and how could we tell? What's the difference between pain and suffering? And are there evolutionarily adaptive reasons why animals would have the subjective experience of pain, as opposed to just instinctive reflexes to avoid potentially harmful stimuli?...

Rationally Speaking #158 - Dr. George Ainslie on "Negotiating with your future selves"
Ever make a plan to diet, or exercise, or study, and then -- when the scheduled hour rolls around -- decide, "Nah, I'll just put it off another day"? If you said "no," I don't believe you! This episode features behavioral psychiatrist (and economist) George Ainslie, who demonstrated the existence of this ubiquitous phenomenon in human willpower, called hyperbolic discounting, in which our preferences change depending on how immediate or distant the choice is. George and Julia discuss why hyperbolic ...


Rationally Speaking #157 - Dr. Herculano-Houzel on "What made the human brain special?"
For centuries, scientists have wondered what makes humans so much smarter than other species. Some proposed it was the size of our brain (though that didn't explain why whales weren't smarter than us); others thought it was the size of our brain relative to our body size (but there were problems with that explanation as well). In this episode, neuroscientist Suzana Herculano-Houzel lays out the mystery of the "Human advantage," and explains how a new technique she invented several years ago has shed light o...

Rationally Speaking #156 - David McRaney on "Why it’s so hard to change someone’s mind"
You're probably already aware that it's hard to change someone's mind with logical arguments and evidence, especially about emotionally charged topics. But are there exceptions? David McRaney, bestselling author of "You Are Not So Smart" (and host of the blog and podcast by the same name) describes his experiences with people who have done an about-face on some important topic, like 9/11 conspiracy theories. He and Julia discuss a technique for changing someone's mind with evidence, how individual mind-ch...


Rationally Speaking #154 - Tom Griffiths on "Why your brain might be rational after all"
You've probably heard about cognitive biases -- the systematic errors human brains make when we try to reason or make decisions. But what if our biases are actually a sign of rationality? This episode features Tom Griffiths, professor of cognitive science at University of California, Berkeley and the director of the Computational Cognitive Science lab. Tom makes the case for why our built-in reasoning strategies might be optimal after all....

Rationally Speaking #153 - Dr. Vinay Prasad on "Why so much of what we 'know' about medicine is wrong"
We like to think of doctors as experts, whose recommendations are backed up by solid evidence. So why does it keep happening that a widely used medical intervention -- like estrogen replacement therapy, or heart stents -- turns out to be useless, or even harmful? This episode features Dr. Vinay Prasad, author of "Ending Medical Reversal: Improving Outcomes, Saving Lives," who talks with Julia about why medical research is so often fatally flawed, and what we can do about it....

Rationally Speaking #152 - Dan Fincke on "The pros and cons of civil disagreement"
Julia invites philosopher and blogger Dan Fincke onto the show, inspired by a productive disagreement they had on Facebook. Their topic in this episode: civility in public discourse. Do atheists and skeptics have a responsibility to be civil when expressing disagreement, and does that responsibility vary depending on who their target is? Is there a legitimate role for offensive satire? And might there be downsides to civility? Dan and Julia also revisit the subject of their original disagreement: the recen...


Rationally Speaking #151 - Maria Konnikova on "Why everyone falls for con artists"
You've probably heard about victims of con artists -- like the people who hand over their life savings to sketchy gurus or psychics, or the people who wire thousands of dollars to a "Nigerian prince" who just needs some help getting his far bigger fortune to you. And you've probably thought to yourself, "What a sucker. I'd never fall for something like that." But are you sure? In this episode of Rationally Speaking, Julia interviews Maria Konnikova, science journalist and author of "The Confidence Game: W...

Rationally Speaking #150 - Elizabeth Loftus on "The malleability of human memory"
Do you remember when you were a kid, and you had that great day at Disneyland where you got to meet Bugs Bunny? No? Think harder. It was a sunny day... In this episode of Rationally Speaking, Julia interviews psychologist Elizabeth Loftus, whose pioneering work on human memory revealed that our memories can be contaminated by the questions people ask us, or by misinformation we encounter after the fact -- even to the point of making us remember entire events that never could have happened. (Like meeting B...

Rationally Speaking #149 - Susan Gelman on "How essentialism shapes our thinking"
In this episode, psychologist Susan Gelman describes her work on the psychological trait of essentialism: the innate human urge to categorize reality and to assume that those categories reflect meaningful, invisible differences. Julia and Susan discuss why the discovery of essentialism in children was such a surprise to scientists, how the language we use affects the way we view reality, and whether essentialism is to blame for bad philosophy....


Rationally Speaking #148 - David Kyle Johnson on "The Myths that Stole Christmas"
We're all familiar with Santa Claus -- but how much do you *really* know about that jolly old elf? In this episode, Julia interviews philosophy professor David Kyle Johnson, the author of "The Myths that Stole Christmas." Kyle explains the little-known, and somewhat sinister, origin story of Santa Claus -- and then Kyle and Julia debate whether it's ethical to lie to your children about the reality of Santa Claus (and possible alternatives to explore)....

Rationally Speaking #147 - Andrew Gelman on "Why do Americans vote the way they do?"
There are two contradictory stories about politics and class: On the one hand, that the Republicans are the party of the fat cat businessmen and the Democrats are the party of the people. And on the other hand, that the Republicans are the party of the salt-of-the-earth Joe Sixpacks, while the Democrats are latte-sipping elites. In this episode, professor of statistics and political science Andrew Gelman shines some clarifying light on the intersection between politics and class in America, explaining what ...

Rationally Speaking #146 - Jesse Richardson on "The pros and cons of making fallacies famous"
This episode of Rationally Speaking features Jesse Richardson, a creative director who has been using his advertising background "for good and not for evil," as he puts it -- by building skeptic sites that go viral. Jesse's most famous creation is "Your Logical Fallacy Is," an illustrated poster featuring the names and descriptions of various common fallacies. Julia asks: Aren't many so-called logical fallacies not actually fallacious? Is encouraging people to call out fallacies helping rational discourse o...


Rationally Speaking #145 - Phil Tetlock on "Superforecasting: The Art and Science of Prediction"
Most people are terrible at predicting the future. But a small subset of people are significantly less terrible: the Superforecasters. On this episode of Rationally Speaking, Julia talks with professor Phil Tetlock, whose team of volunteer forecasters has racked up landslide wins in forecasting tournaments sponsored by the US government. He and Julia explore what his teams were doing right and what we can learn from them, the problem of meta-uncertainty, and how much we should expect prediction skill in one...

Rationally Speaking #144 - Bryan Caplan on "Does parenting matter?"
Parents in the United States are spending more time and energy than ever to ensure that their children turn out happy, healthy, and successful. But what does the evidence suggest about the impact of their efforts? Economist Bryan Caplan (and the author of "Selfish Reasons to Have More Kids") argues that, despite our intuition that parenting choices affect children's life outcomes, there's strong evidence to the contrary. Bryan and Julia discuss his case, and explore what that means for how people should par...

Rationally Speaking #143 - Scott Aaronson on "The theorem that proves rationalists can't disagree"
Can rational people disagree? This episode of Rationally Speaking features guest Scott Aaronson. Scott is a professor of computer science at MIT and has written about "Aumann's Agreement Theorem," which is related to Bayesian probability theory and seems to imply that two people cannot rationally disagree after they've shared their opinions and information with each other. Julia and Scott discuss how to reconcile Aumann's theorem with real-world disagreements, and explore the disconcerting question: Why sho...


Rationally Speaking #142 - Paul Bloom on "The case against empathy"
"I'm writing a book on empathy," psychologist Paul Bloom tells people. They respond warmly, until he follows up with, "I'm against it." On this episode of Rationally Speaking, Julia and Paul discuss what empathy is, why Paul is concerned that it's a terrible guide to moral decision making, and what the alternatives are....

Rationally Speaking #141 - Dan Sperber on "The Argumentative Theory of reason"
The traditional story about reason is that it evolved to help humans see the world more clearly and (thereby) make better decisions. But on that view, some mysteries remain: why is the human brain so biased? Why are we so much better at defending our pre-existing views than at evaluating new ideas objectively? In this episode of Rationally Speaking, Julia talks with guest Dan Sperber, professor of cognitive and social sciences, who is famous for advancing an alternate view of reason: that it evolved to h...

Rationally Speaking #140 - Kenny Easwaran on, "Newcomb's Paradox and the tragedy of rationality"
This episode of Rationally Speaking features philosopher Kenny Easwaran, who delves into the notorious "Newcomb's Paradox" -- the puzzle about which it was once said, "To almost everyone it is perfectly clear and obvious what should be done. The difficulty is that these people seem to divide almost evenly on the problem, with large numbers thinking that the opposing half is just being silly." Kenny and Julia explore how Newcomb's Paradox is related to other puzzles in decision theory, like the Prisoners' Di...


Rationally Speaking #139 - Eric Schwitzgebel on "Moral hypocrisy: why doesn't knowing about ethics make people more ethical?"
You might expect that professional ethicists -- people whose job it is to determine which behaviors are ethical and why -- would behave more ethically than other people. You'd be wrong! This episode features philosopher Eric Schwitzgebel , who is well known for his work studying whether experts in ethics live up to their own standards. He and Julia discuss why the answer is "no," and explore questions like, "How do you decide how moral you're going to try to be?" Eric Schwitzgebel is a Professor of Phil...

Rationally Speaking #138 - Ian Morris on, "Why the West rules -- for now"
For several centuries, historians have tried to answer the question: "Why is Western Europe (and later, North America) the dominant world power?" Past explanations cited culture, or "great men" who influenced the course of history. Stanford historian Prof. Ian Morris casts doubt on those explanations, instead taking a data-driven approach to the question that attempts to measure "social development" over history and find explanations for it. In this episode of Rationally Speaking, Julia delves into Morris' ...

Rationally Speaking #137 - Marc Lipsitch on, "Should scientists try to create dangerous viruses?"
A controversial field of research is "gain-of-function," in which scientists take a virus (like a strain of flu) and attempt to make it more dangerous, for example by making it transmissible in mammals when it had previously been solely an avian flu. The motivation is to learn how viruses might mutate in nature so that we can be prepared -- but what if those engineered "superbugs" escape the lab and start a pandemic? In this episode of Rationally Speaking, Harvard professor of epidemiology Marc Lipsitch arg...


Rationally Speaking #136 - David Roodman on Why Microfinance Won't Cure Global Poverty
Can we pull the world's poor out of poverty by giving them access to financial services? This episode features a conversation with economist David Roodman, formerly a fellow at the Center for Global Development and senior advisor to the Gates Foundation, currently senior advisor to the Open Philanthropy Project, and the author of Due Diligence: An Impertinent Inquiry into Microfinance. Roodman casts a critical eye on the hype about microfinance as a panacea for global poverty. He and Julia explore why it's ...

Rationally Speaking #135 - Robin Hanson on: "Most human behavior is signaling"
In this episode, economist Robin Hanson explains the signaling theory of human behavior: That our motivations for our choices, about school, shopping, medical care, and so on, evolved primarily to shape other people's perceptions of us. In the process Robin and Julia discuss what makes a good theory: How to decide what you should (a priori) expect to see, and why simplicity is a virtue. Robin Dale Hanson is an associate professor of economics at George Mason University and a research associate at the Fut...

Rationally Speaking #134 - Michael Shermer on: "Science drives moral progress"
Common wisdom holds that the world is getting more violent, but is that really true? Leading skeptic Michael Shermer, professor and author of many books on science, morality and skepticism, argues to the contrary. Shermer's thesis in his recent book, "The Moral Arc: How Science Leads Humanity Toward Truth, Justice, and Freedom," is that as science has advanced our understanding of the world, we have become more willing to expand our circle of empathy beyond our own provincial "tribes," and more able to desi...


Rationally Speaking #133 - Sean Carroll on "The Many Worlds Interpretatioln Is Probably Correct"
In this episode of Rationally Speaking, Caltech physicist Sean Carroll describes an "embarrassing" state of affairs in modern physics: that we still don't know how to interpret quantum mechanics, almost a century after its discovery. Sean explains why he thinks the "Many Worlds Interpretation" (MWI) is the most plausible one we've got, and Julia explores his thoughts on questions like: Can MWI be tested? Is it "simpler" than other interpretations, and why? And does MWI threaten to destroy our systems of eth...

Rationally Speaking #132 - Live From NECSS 2015
This live episode of Rationally Speaking, taped at the 2015 Northeast Conference on Science and Skepticism, is a special one: it's Massimo's last episode as co-host! He and Julia look back over their history together and discuss which topics they've changed their mind about since the podcast began....

Rationally Speaking #131 - James Randi on Being An Honest Liar
The Amazing Randi, famous magician and a pioneer of Skepticism, joins this episode of Rationally Speaking for a conversation about the past and future of the Skeptic movement. Massimo and Julia's questions for Randi include: Do you think Skepticism has shaped public opinion in any significant ways? What do you want the JREF to look like several years from now? And what have you changed your mind about, and why?...


Rationally Speaking #130 - The Atheists Own 10 Commandments
Do atheists need their own 10 commandments? What would such a thing look like? In this episode, Julia and Massimo discuss a recent attempt to define some secular commandments. They debate the relevance of particular commandments, like "All truth is proportional to the evidence," and the purpose of the project overall, and address some criticism of the commandments....

Rationally Speaking #129 - Would the World Be a Better Place Without Religion?
Atheists often take it as a given that the world would be better off without religion. But what does the evidence so far really say? In this episode, Massimo and Julia discuss a recent article in the Skeptical Inquirer presenting research that shows a moderate correlation between religiosity and prosocial traits like altruism. Should we doubt the research? And if not, are there other reasons to suspect that religion's net effect on the world is negative?...

Rationally Speaking #128 - 5th Anniversary Live Show
This episode marks the fifth anniversary of the Rationally Speaking podcast! To commemorate the occasion, Massimo and Julia hold a live-streaming Q&A in which they respond to questions submitted via Twitter. Topics include: What's the best book to read to improve your rationality? What's the biggest problem with the skeptic community? How can we get politicians to be reasonable? And how can you be so sure that other people exist? Halfway through the show, Massimo makes a surprising and poignant announcement...


Rationally Speaking #127 - Elise Crull on Philosophy of Physics
Feynman famously said that a philosopher of science is as much use to scientists as an ornithologist is to birds. This episode of Rationally Speaking features philosopher of physics Elise Crull, who explains why Feynman is misguided, and what philosophers have to say about important issues in physics -- like quantum mechanics, physical laws, and whether anything "really" exists at all....

Rationally Speaking #126 - Preston Bost on Crazy Beliefs, Sane Believers
Can it be rational to believe conspiracy theories? On this episode of Rationally Speaking, Julia and Massimo welcome Prof. Preston Bost, a professor of psychology at Wabash College who investigates what kinds of people latch onto conspiracy theories, and why. The three discuss evolutionary reasons for conspiracy theories' appeal, and ask: how do you determine whether a belief is "rational," anyway?...

Rationally Speaking #125 - The Quantified Self
People have been keeping track of their moods, sleeping, dietary habits and more for hundreds of years -- Benjamin Franklin famously recorded instances of his virtues and vices. But only in the last decade has the rise of smartphones and fast computing created the new "Quantified Self" movement in which some people are trying to mine their own data for insights about how to be happier and more effective. In this episode, Massimo and Julia discuss self tracking -- what you can learn from it, and what its pit...


Rationally Speaking #124 - Stoicism
Did you miss International Stoic Week this year? Well, it's not too late to catch Massimo and Julia's analysis of the ancient philosophy of stoicism, which advocates (among other things) practicing mindfulness, accepting the things you can't change, and regulating negative emotions. Come hear the results of Massimo's experimentation with stoicism and listen to him and Julia debate several potential problems with the philosophy....

Rationally Speaking #123 - Daniel Lakens on P-Hacking and Other Problems in Psychology Research
What's wrong with the social sciences? In this episode, Massimo and Julia are joined by Professor Daniel Lakens from the Eindhoven University of Technology, who studies psychology and blogs about research methods and open science. The three discuss why so many psychology papers can't be trusted, and what solutions might exist for the problem (including how to fix the skewed incentives in the field)....

Rationally Speaking #122 - The Science and Philosophy of Humor
In this episode of Rationally Speaking, Massimo and Julia delve into the science and philosophy of comedy, exploring questions like: Why did humans evolve to have a sense of humor? What's the relationship between comedy and existential terror? And how many bad philosophy jokes can Massimo tell before Julia loses it entirely?...


Rationally Speaking #121 - Benjamin Todd on 80,000 Hours
If you want to choose a career that helps other people effectively, which should you pick? Medicine? Research? Non-profit? The answers may not be as straightforward as you think. This episode of Rationally Speaking features special guest Benjamin Todd, the co-founder and executive director of 80,000 Hours, an organization devoted to helping people choose career paths to do good better. Ben, Massimo and Julia debate the heuristics that should go into career choice, utilitarianism vs. virtue ethics, and what ...

Rationally Speaking #120 - Nihilism
Are you a nihilist? Forget about wearing all black and being indifferent to the rest of the world -- nihilism is a lot more complicated than most people think. In this episode of Rationally Speaking, Massimo and Julia explain the different types of philosophical nihilism, reveal their own personal views on the subject, and explore why nihilism has such different emotional effects on different people....

Rationally Speaking #119 - Aaron James on Assholes (and Bitches)
You probably feel like you can recognize someone who's an asshole when you're unlucky enough to encounter him. But can you really? Philosophy professor Aaron James, the author of "Assholes: A Theory," joins the podcast to lay out just what makes an asshole an asshole, and why they're so uniquely maddening. Massimo, Julia and Aaron debate the assholery of certain people in politics and atheism, explore the difference between an asshole and a bitch, and swap coping mechanisms....


Rationally Speaking #118 - Live From Baruch College With Dr. Steven Novella
Taped in front of a live audience at Baruch College in New York, this episode of Rationally Speaking features special guest Steve Novella: neurologist, author of the blogs NeuroLogica and Science Based Medicine, and co-host of the Skeptic's Guide to the Universe (SGU) podcast. Steve, Massimo, and Julia discuss the recent lawsuit facing the SGU, share their gripes about the ways that skeptics sometimes oversimplify the issues, and answer audience questions such as, "Is anything off-limits to skeptical activi...

Rationally Speaking #117 - Maria Konnikova on How to Think Like Sherlock Holmes
Want to learn how to use your logical, reflective side in everyday life? It's elementary, my dear listeners! Maria Konnikova, the author of the bestselling Mastermind: How to Think Like Sherlock Holmes is the special guest on this episode of Rationally Speaking. Konnikova has a Ph.D. in psychology from Columbia University and writes about science for publications including the New Yorker, New York Times, Wall Street Journal, and more. Julia and Massimo ask her for tips on Holmesian thinking, and debate her ...

Rationally Speaking #116 - Jim Baggott and Massimo on Farewell to Reality
As part of our special mini-interviews series, Massimo talks to Jim Baggott, author of “Farewell to Reality: How Modern Physics Has Betrayed the Search for Scientific Truth.” Jim is one of an increasingly vocal number of critics of some directions taken lately by research in fundamental theoretical physics, and particularly of string theory. Massimo and Jim explore what it means for some physicists to call for a new era of “post-empirical” science....


Rationally Speaking #115 - Maarten Boudry and Massimo On the Difference Between Science and Pseudoscience
In our first mini-interview episode Massimo sits down to chat with his colleague Maarten Boudry, a philosopher of science from the University of Ghent in Belgium. Maarten recently co-edited the volume on The Philosophy of Pseudoscience (Chicago Press) with Massimo, and the two chat about the difference between science and pseudoscience and why it is an important topic not just in philosophy circles, but in the broader public arena as well....

Rationally Speaking #114 - Massimo and Julia Go Freestyle
In this special episode of Rationally Speaking, Julia and Massimo go rogue: no guest, no pre-set topics, just conversation about things on their mind. Among other things, the duo discuss the questions of how to change your mind (Julia describes her "surprise journalling" method) and, importantly: How do you know if you're a jerk?...

Rationally Speaking #113 - The Turing Test
Did you know that an artificial intelligence named "Eugene Goostman" recently passed the Turing Test, our gold standard criterion for whether an AI is conscious? At least, that's what many media outlets breathlessly reported. In this episode of Rationally Speaking, Julia and Massimo take a critical look at Eugene, and at the Turing test in general as a standard for consciousness. In the process they debate what it would mean for an AI to be conscious, and how we could ever tell....


Rationally Speaking #112 - Race: Just a Social Construct?
In this episode, Julia and Massimo talk about the problems with "race" as a genetically-based concept. Starting with the controversial recent book "A Troublesome Inheritance," by NY Times science writer Nicholas Wade, they critique the statistical analyses that group people into racial categories, and Wade's (and others') attempts to attribute differences between rich and poor countries to innate racial differences....

Rationally Speaking #111 - Human Nature
Ever heard someone sigh, "That's just human nature"? Have you wondered what that meant? In this episode of Rationally Speaking, Julia and Massimo delve into the science and philosophy of human nature: what traits are "built in" to being human, and how would we know? And once we know what human nature consists of, should we try to protect it against changes?...

Rationally Speaking #110 - Scientia, the Unity of Knowledge
For all the sniping that goes on between science and philosophy it's easy to forget that both fields are part of "scientia," the pursuit of knowledge and understanding. In this episode of Rationally Speaking, Julia and Massimo discuss the latter's new "Scientia Salon" online journal, how the boundaries blur between math, science and philosophy, and how the Internet can change scientific research....


Rationally Speaking #109 - Rebecca Newberger Goldstein on Plato at the Googleplex
Rebecca Newberger Goldstein -- philosopher, author, and Genius-grant recipient -- returns to the Rationally Speaking podcast to discuss her latest book, "Plato at the Googleplex: Why Philosophy Won't Go Away." Rebecca, Julia and Massimo argue over the value of philosophy in modern science, and whether it makes sense to designate "experts" in ethical reasoning....

Rationally Speaking #108 - Suicide
"There is but one truly serious philosophical problem, and that is suicide," wrote Albert Camus. In this episode of Rationally Speaking, Massimo and Julia discuss the ethics of suicide through the lens of several major philosophies. They also explore the social science of suicide: how does one person's suicide affect the community?...

Rationally Speaking #107 - MOOCs
Does the future belong to MOOCs? Massive Open Online Courses, or MOOCs for short, have been hailed as the next wave in secondary education, poised to replace brick-and-mortar colleges with their expensive infrastructure and sky-high tuition. In this episode of Rationally Speaking, Julia and Massimo discuss how to measure MOOCs' effectiveness, separating the hype from the genuine promise....


Rationally Speaking #106 - Live From NECSS With Lawrence Krauss
Rationally Speaking returns to NECSS for a live show with Lawrence Krauss, theoretical physicist and author of best selling books like The Physics of Star Trek and A Universe from Nothing. Julia and Massimo chat with Lawrence about whether the laws of the universe demand some kind of explanation, whether string theory should be deemed a failure, and how he ended up featured in a geocentrist documentary....

Rationally Speaking #105 - Greta Christina on Coming Out Atheist
Atheist activist and author Greta Christina appears on this episode of Rationally Speaking, to discuss her new book, "Coming Out Atheist: How to Do It, How to Help Each Other, And Why." A spirited debate ensues, in which Greta, Julia and Massimo disagree over the boundaries of the "atheist movement," and the role of social justice in it. Other topics include: The cognitive biases that can make it hard to get a clear picture of whether people regret "coming out" as atheists; Plus, Greta's argument for why at...

Rationally Speaking #104 - Edward Frenkel on Love and Math
Can you find beauty -- even romance -- in mathematics? Mathematician Edward Frenkel, author of "Love and Math," joins Rationally Speaking to talk about how the subject seduced him as a young man, and how he believes it's generally mis-taught in schools. Other topics include: the search for a "grand unified theory" of mathematics, and the splash Edward caused when he produced -- and starred in -- "Rites of Love and Math," a steamy short film about equations....


Rationally Speaking #103 - Neil deGrasse Tyson on Why He Doesn't Call Himself an Atheist
Astrophysicist Neil deGrasse Tyson returns for this episode of Rationally Speaking, with a particular question to discuss: Should he call himself an atheist? The impetus is a recent dust-up over Neil's appearance on Big Think, in which he explained that he avoids the label "atheist" because it causes people to make all sorts of unflattering (and often untrue) assumptions. Julia and Massimo reply with some counterarguments, and along the way delve into the philosophy of language....

Rationally Speaking #102 - Zach Weinersmith on His "SMBC" Webcomic
This episode features special guest Zach Weinersmith, author of "Saturday Morning Breakfast Cereal," a popular webcomic about philosophy and science. Zach clarifies his position in the ongoing "philosophy vs. science" fight, poses a question to Julia and Massimo about the ethics of offensive jokes, and discusses BAHFest, his "Bad Ad Hoc Hypotheses" conference lampooning evolutionary psychology and his movie "Starpocalype." Somehow along the way, the three take a detour into discussing an unusual sexual act....

Rationally Speaking #101 - Max Tegmark on the Mathematical Universe Hypothesis
Those among us who loathed high school calculus might feel some trepidation at the premise in this week's episode of Rationally Speaking. MIT Physicist Max Tegmark joins us to talk about his book "Our Mathematical Universe: My Quest for the Ultimate Nature of Reality" in which explains the controversial argument that everything around us is made of math. Max, Massimo and Julia explore the arguments for such a theory, how it could be tested, and what it even means....


Rationally Speaking #100 - Live Q&A: Massimo and Julia Answer Everything!
On this episode, recorded live at the Jefferson Market Library in New York City, Rationally Speaking podcast celebrates its 100th episode! The show features a full hour of audience Q’s and Julia & Massimo’s A’s. Topics range from science, philosophy and the borderlands between the two. The questions push the hosts to think on their feet, and even to admit their ignorance on stage!...

Rationally Speaking #99 - Judith Schlesinger Exposes the Myth of the Mad Genius
Creative geniuses are always a little bit cuckoo, right? At least, that's the impression you'd get from TV, movies, and plenty of common wisdom. In this episode of Rationally Speaking, Massimo and Julia are joined by psychologist Judith Schlesinger, author of The Insanity Hoax: Exposing the Myth of the Mad Genius, who explains why she thinks the "mad genius" archetype is simply the result of folklore, misunderstanding, and bad research....

Rationally Speaking #98 - Jerome Wakefield on Psychiatric Diagnoses: Science or Pseudoscience?
What qualifies someone as mentally ill? The standard for diagnosis is the Diagnostic and Statistical Manual of Mental Disorders (DSM), which just released a 5th edition in 2013 -- but just how objective is it? This episode of Rationally Speaking features Dr. Jerome Wakefield, psychiatrist, PhD in philosophy, and author of "The Loss of Sadness: How Psychiatry Transformed Normal Sorrow into Depressive Disorder." Julia, Massimo and Jerome talk about the arbitrariness of the DSM and the controversies around the...


Rationally Speaking #97 - Peter Singer on Being a Utilitarian in the Real World
Few philosophers have as wide of an impact on the general public as ethicist Peter Singer, this week's guest on Rationally Speaking podcast. Singer's utilitarian arguments about how we should treat animals, why we have a moral obligation to give to charity, whether infants should count as "people," and more have won him widespread fame -- and notoriety -- over the last few decades, and launched multiple movements. Tune in to hear his discussion with Massimo and Julia about why he's a utilitarian, and how hi...

Rationally Speaking #96 - Sally Satel and Scott Lilienfeld on the Seductive Appeal of Mindless Neuroscience
It seems like a week can't go by without a news story about how neuroscience has discovered the neurological basis of love, morality, addiction, you name it. Yet how much explanatory power does neuroscience really have -- and are we putting too much trust in its findings? On this episode of Rationally Speaking, Massimo and Julia explore these questions with psychiatrist Sally Satel and professor of psychology Scott O. Lilienfeld, the authors of "Brainwashed: The Seductive Appeal of Mindless Neuroscience."...

Rationally Speaking #95 - Gerard O'Brien On the Computational Theory of Mind
Is the mind a kind of computer? This episode of Rationally Speaking features philosopher Gerard O'Brien from the University of Adelaide, who specializes in the philosophy of mind. Gerard, Julia, and Massimo discuss the computational theory of mind and what it implies about consciousness, intelligence, and the possibility of uploading people onto computers....


Rationally Speaking #94 - Maarten Boudry on Philosophy of Pseudoscience: Reconsidering the Demarcation Problem
What's the difference between science and pseudocience -- and is it even possible to draw a clean line separating them? In this episode of Rationally Speaking, Massimo and Julia interview philosopher Maarten Boudry from Ghent University. Tune in to hear them discuss Massimo and Maarten's new book, "Philosophy of Pseudoscience: Reconsidering the Demarcation Problem"... and stick around to learn how Maarten pranked theologians....

Rationally Speaking #93 - Dr. Michael E. Mann On The Science Of Climate Change
In this episode of Rationally Speaking, Julia and Massimo talk to physicist and climatologist Michael Mann about how we know the climate is getting warmer. Among other things, they cover the physical processes of climate change, the role that predictive models have played in confirming scientists' theories about the rate of warming, and what are uncertainties in the science. Also, how optimistic we should be about technological solutions to the problem. Dr. Michael E. Mann is Distinguished Professor of M...

Rationally Speaking #92 - Dr. Paul Offit On Believing in Magic
How has alternative medicine managed to become so mainstream? This episode of Rationally Speaking features Dr. Paul Offit, award-winning specialist in vaccines, immunology and pediatrics, and author of popular books such as "Do You Believe in Magic?: The Sense and Nonsense of Alternative Medicine." Julia and Massimo interview Dr. Offit about the fight against alternative medicine, why it's still unregulated, and whether or not to tell patients about placebos....


Rationally Speaking #91 - Kendrick Frazier On Skeptical Inquiry
On this episode of Rationally Speaking, Massimo and Julia survey the present, past, and future of skepticism. Special guest Kendrick Frazier, editor of Skeptical Inquirer, talks about how the movement's focus has changed and what the frontiers of skepticism should be. Kendrick Crosby Frazier is a science writer and editor of Skeptical Inquirer magazine for over 30 years. He is also a former editor of Science News, author or editor of ten books, and a Fellow of the American Association for the Advancemen...

Rationally Speaking #90 - On Wine, Water, and Audio
In this episode of Rationally Speaking, Julia and Massimo turn their attention to connoisseurship -- or snobbery, depending on your point of view! Fine wines, bottled water, high-end audio equipment -- what all these have in common are passionate customers who are discriminating enough to pay top dollar for subtle differences between options. Or are they? This episode explores the evidence on whether connoisseurs can really tell the difference between, for example, the $7 wine and the $700 one -- or whether...

Rationally Speaking #89 - Online Dating
Looking for love online? You're not alone -- one in five new relationships nowadays begin on a dating site. But just how scientific are the "matching algorithms" sites like eHarmony and OKCupid use? What does cognitive psychology tell us about how this new choice context affects our happiness? Massimo and Julia turn an analytical eye on the math and science of online dating, in this episode of Rationally Speaking....


Rationally Speaking #88 - Mario Livio on Brilliant Blunders
The next time you're kicking yourself for some stupid mistake, remember: Even history's genuises screw up! Astrophysicist and author Mario Livio joins this episode of Rationally Speaking to talk about his latest book, "Brilliant Blunders: From Darwin to Einstein - Colossal Mistakes by Great Scientists That Changed Our Understanding of Life and the Universe." Learn about why Darwin's theory of natural selection "shouldn't" have worked, why Einstein was confused about the role of aesthetics in physics, why Ho...

Rationally Speaking #87 - Sean Carroll on Naturalism
Astrophysicist and author Sean Carroll joins this episode of Rationally Speaking, to talk about "naturalism" -- the philosophical viewpoint that there are no supernatural phenomena, and the universe runs on scientific laws. Sean, Julia, and Massimo discuss what distinguishes naturalism from similar philosophies like physicalism and materialism, and what a naturalistic worldview implies about free will, consciousness, and other philosophical dilemmas. And they return to that long-standing debate: should scie...

Rationally Speaking #86 - Live From NECSS With Jim Holt On Why Does the World Exist?
Why does the universe exist? And is that even a sensical question to ask? Philosopher Jim Holt has written extensively for publications such as the New Yorker, the New York Times and Harper's, and most recently embarked on this "existential detective story" in his new book, "Why Does the World Exist?: An Existential Detective Story" Jim discusses his book with Massimo and Julia in this live episode of Rationally Speaking, taped at the 2013 Northeast Conference on Science and Skepticism in New York City....


Rationally Speaking #85 - Live From NECSS With Michael Shermer On the Role of Science in Morality
In a special live Rationally Speaking, taped at NECSS 2013, Julia Galef moderates a lively discussion between Massimo and Michael Shermer, head of the Skeptic Society and founding publisher of Skeptic Magazine. The topic: Can science tell us what is "moral"? This discussion comes after both men have tackled the question separately in books (Massimo's Answers for Aristotle and Michael's The Science of Good and Evil), and jointly in a recent debate on the Rationally Speaking blog. Questions under debate inclu...

Rationally Speaking #84 - Stephen Asma On the Myth of Universal Love
Just like love, motherhood, and apple pie, no one could be against fairness. No one, that is, except philosopher Stephen Asma, the author of "Against Fairness." Massimo and Julia sit down with Stephen in this episode of Rationally Speaking, to talk about what he thinks is wrong with the concept of fairness -- and about certain traditional values he thinks are more important....

Rationally Speaking #83 - Samuel Arbesman On The Half-Life of Facts
How long does it take for one-half of everything we know about a subject to be proven wrong? Depends on the subject. 45 years, for example, if that subject is cirrhosis or hepatitis. Samuel Arbesman, applied mathematician and author of "The Half-Life of Facts: Why Everything We Know Has an expiration Date", joins Julia and Massimo to talk about the hidden patterns underlying how fast our understanding of science is changing....


Rationally Speaking #82 - It's Not Easy Being Green
If you're an ethically minded consumer, you should buy organic because it's better for the environment, right? Actually, the case isn't so clear-cut. But you should certainly buy fair-trade because it's better for foreign laborers, right? Well... that's complicated too. In this episode of Rationally Speaking, Julia and Massimo talk about how hard it is to know how much good you're accomplishing with your purchases, or whether you're even doing any good at all....

Rationally Speaking #81 - Live! Ben Goldacre on Bad Pharma
"Medicine is broken," warns Ben Goldacre, the British physician, academic, author of the Guardian's Bad Science column. In this live episode of Rationally Speaking, Massimo and Julia interview Ben about his new book, Bad Pharma, and how the evidence about pharmaceutical drugs gets distorted due to shoddy regulations, missing data, and the influence of drug companies....

Rationally Speaking #80 - Dear Abby
In honor of the passing of Dear Abby columnist Pauline Philips, Massimo and Julia talk about the history and philosophy of advice. How do you rationally evaluate advice, and how do you give rational advice? Along the way they discuss some of Dear Abby's snarkiest moments, the origins of the advice column in 1680, and some of the worst advice ever given....


Rationally Speaking #79 - Chris Mooney on The Republican War on Science
Can science denialism be blamed on a "Republican brain"? In other words: is there something about the psychology of Republicans that makes them inclined to reject the scientific consensus on topics like evolution and climate change? Special guest Chris Mooney argues there is, elaborating on the thesis in his popular book, "The Republican Brain: The Science of Why They Deny Science- and Reality." Massimo and Julia debate whether the evidence support Chris's thesis....

Rationally Speaking #78 - Intelligence and Personality Testing
What's your IQ? Are you an ENTJ, or maybe an ISFP? What's your Openness score, your Conscientiousness score, your Neuroticism score? And just how seriously should you take all those test scores, anyway? In this episode of Rationally Speaking, Massimo and Julia discuss the science -- and lack thereof -- of intelligence and personality testing....

Rationally Speaking #77 - Victoria Pitts-Taylor on Feminism and Science
In this episode, Massimo and Julia discuss sociology and feminism, with special guest Victoria Pitts-Taylor, professor of sociology at the Graduate Center of the City University of New York. Victoria explains how feminists in sociology are dealing with results in neuroscience and evolutionary biology, especially regarding the question: How much inborn difference is there really between women and men? Massimo and Julia challenge Victoria on some academic feminist views, and investigate how the fields of soci...


Rationally Speaking #76 - Crowdsourcing and the Wisdom of Crowds
What do Linux, Netflix, and the Oxford English Dictionary have in common? They've all benefited from the power of crowdsourcing, in which a task is outsourced to a group of hundreds or thousands of disparate people. In this episode of Rationally Speaking, Julia and Massimo discuss the phenomena of crowdsourcing, and ask: What makes it work? Is it ever unethical? And what are the limits to the wisdom of crowds?...

Rationally Speaking #75 - When Scientists Kill
We look to scientists to keep us informed about risks, such as: is this medicine effective? Is that level of toxicity harmless? How severe should we expect this upcoming storm to be? But when lives are at stake, tricky questions arise about how much responsibility falls on scientists' shoulders to get those estimations *right* -- and whether scientists should be punished if they fail. In this episode of Rationally Speaking, Massimo and Julia discuss a recent court case that shocked the world: A group of Ita...

Rationally Speaking #74 - Live! John Shook on Philosophy of Religion
Massimo and Julia visit Indianapolis for a heated debate, in this live episode of Rationally Speaking. At a symposium organized by the Center for Inquiry (CFI), they join up with John Shook, Director of Education and Senior Research fellow at the CFI, and the author of more than a dozen books on philosophy and religion. Sparks fly as the three debate questions like: Should science-promoting organizations, like the National Center for Science Education, claim publicly that science is compatible with religion...


Rationally Speaking #73 - Answers for Aristotle
In this episode Julia interviews Massimo about his new book, Answers for Aristotle: How Science and Philosophy Can Lead Us to A More Meaningful Life. Massimo's central idea is that a combination of science and philosophy, what he calls "Sci-Phi," is the best guide to the big questions in life, from issues of morality and justice to the meaning of love and friendship. The book's title derives from the fact that Aristotle was the first philosopher-scientist, adopting the sci-phi framework and posing a number ...

Rationally Speaking #72 - Graham Priest on Paradoxes and Paraconsistent Logic
Can a statement be simultaneously true and false? That might seem like sheer nonsense to you -- but not to certain modern logicians. In this episode Massimo and Julia are joined again by philosopher and logician Graham Priest, who explains why we have to radically revise our notions of "true" and "false." In the process, he explains classic puzzlers like the "barber paradox": "In a village, the barber shaves all men who do not shave themselves. Does he shave himself?" Follow along for an episode that really...

Rationally Speaking #71 - On Science Fiction and Philosophy
By its very nature, science fiction has always been particularly suited to philosophical exploration. In fact, some of the best science fiction novels, short stories, movies, and TV shows function like extended philosophical thought experiments: what might cloning tell us about our views on personal identity? If we could all take a pill to be happy, would we want to do that? In this episode, Massimo and Julia recall some of their favorite philosophically-rich science fiction, and debate the potential pitfal...


Rationally Speaking #70 - Graham Priest on Buddhism and Other Asian Philosophies
For all the time Massimo and Julia have spent discussing and debating philosophy on Rationally Speaking, so far, it's all been philosophy from Europe and North America. What about the philosophical traditions of, for example, Asia? In this episode, professor of philosophy Graham Priest offers a brief introduction to the philosophy of India, China, and Japan, and explains why he thinks it should be better known in the West....

Rationally Speaking #69 - James Ladyman on Metaphysics
Compared to other fields of philosophy, "metaphysics" doesn't get a great rap -- it's both dauntingly obtuse and often derided as nonsense. In this episode of Rationally Speaking, Massimo and Julia chat with James Ladyman, Professor of philosophy at the University of Bristol and the author of Every Thing Must Go. The conversation covers: what is metaphysics, exactly, and where (in Ladyman's opinion) has it gone off the rails? Where does traditional science err in its classification of the "building blocks" ...

Rationally Speaking #68 - Applied Rationality
You've heard plenty about biases: the thinking errors the human brain tends to make. But is there anything we can do to make ourselves *less* biased? In this episode, Massimo and Julia discuss what psychological research has learned about "de-biasing," the challenges involved, and the de-biasing strategies Julia is implementing at her organization, the Center for Applied Rationality....


Rationally Speaking #67 - Freudianism as Pseudoscience, With Assorted Comments on Masturbation and Castration...
Can everyone's problems always be traced back to sex, love, and masturbation? In this episode, Massimo and Julia talk about the pseudoscientific aspects of Freud's theories of human psychology. Along the way they explore what philosophy of science has to say about testing theories -- and some of the similarities that Freudianism has with religion, new age mysticism, and psychic reading....

Rationally Speaking #66 - Matthew Hutson on The 7 Laws of Magical Thinking
You may think you're a skeptic, but are you really as free from superstition as you think you are? Matthew Hutson thinks not. The author of "The Seven Laws of Magical Thinking" joins Massimo and Julia on this episode of Rationally Speaking to discuss some common, innate forms of superstition that affect even self-identified skeptics, and why the human brain is predisposed to magical thinking. Along the way, the three debate: Overall, are our superstitions good for us?...

Rationally Speaking #65 - Philosophical Shock Tactics
Why do philosophers sometimes argue for conclusions that are disturbing, even shocking? Some recent examples include the claim that it's morally acceptable to kill babies; that there's nothing wrong with bestiality; and that having children is unethical. In this episode of Rationally Speaking, Massimo and Julia discuss what we can learn from these "Philosophical shock tactics," the public reaction to them, and what role emotion should play in philosophy....


Rationally Speaking #64 - Jesse Prinz on Looking Beyond Human Nature
Nature vs. Nurture? Massimo and Julia revive the age-old debate in this episode of Rationally Speaking, with special guest Jesse Prinz. Jesse is a professor of philosophy at CUNY and the author of several books, most recently "Beyond Human Nature." The trio debate Jesse's argument that human behavior is far more culturally determined than evolutionary psychologists would have you believe, and in the process explore the question of where morality comes from and how to distinguish between nature and nurture....

Rationally Speaking #63 - Consilience: The Unity of Knowledge
Will all knowledge eventually be united? And what does that even mean, anyway? In this episode of Rationally Speaking, Massimo and Julia explore the topic of consilience, or the "unity of knowledge," a concept popularized by biologist and theorizer E. O. Wilson. Along the way they discuss whether all phenomena can be explained in terms of physics, the importance of precise language, and the seductive dangers of the "deepity."...

Rationally Speaking #62 - Patricia Churchland on What Neuroscience Tells Us About Morality
The Rationally Speaking podcast is proud to feature another certified genius: Patricia Churchland, a philosopher well known for her contributions to neurophilosophy and the philosophy of the mind, was professor at the University of California San Diego from 1984-2010, and won the MacArthur Genius Grant in 1991. In this episode, she, Massimo, and Julia discuss what philosophy has to say about neuroscience, what neuroscience has to say about philosophy, and what both of them have to say about morality....


Rationally Speaking #61 - Willpower
This episode of Rationally Speaking is all about the age-old problem of willpower: why don't we do what we know is best for us? Massimo introduces some of the early philosophical approaches to this puzzle, and then Massimo and Julia go over more recent scientific research on the issue (for example: does resisting temptation deplete your reserves of willpower, or does it strengthen your willpower "muscle"?). They also examine possible solutions to the problem, including betting and precommitment, and online ...

Rationally Speaking #60 - Q&A With Massimo and Julia
Massimo and Julia answer listeners' questions. In this installment the topics include: how much do works of fiction affect people's rationality, Bayesian vs. frequentist statistics, what is evidence, how much blame do people deserve when their actions increase the chance of them being targeted, time travel, and whether a philosophically examined life is a better life. Also, all about rationality in the movies, from Dr. Who to Scooby-Doo....

Rationally Speaking #59 - Live at NECSS: David Kyle Johnson on the Simulation Argument
In this special live episode recorded at the 2012 Northeast Conference on Science and Skepticism, Massimo and Julia discuss the "simulation argument" -- the case that it's roughly 20% likely that we live in a computer simulation -- and the surprising implications that argument has for religion. Their guest is philosopher David Kyle Johnson, who is professor of philosophy at King's College and author of the blog "Plato on Pop" for Psychology Today, and who hosts his own podcast at philosophyandpopculture.com...


Rationally Speaking #58 - Intuition
When your intuition tells you something, should you listen? That depends! Relying on intuition can be anything from a highly effective strategy used by experts, to an excuse not to require evidence for your beliefs. In this episode, Massimo and Julia talk about what people mean by "intuition," where our intuitions come from, and when intuition can beat careful reasoning....

Rationally Speaking #57 - Peer Review
If you value scientific evidence you're probably familiar with the idea that having "peer-reviewed" studies is crucial to the legitimacy of any new claim. But what does "peer-reviewed" entail, anyway? In this episode, Massimo and Julia open up the black box of peer review, explaining how the process originated, how it works, and what's wrong with it. They also try brainstorming ways it could be fixed, and ask: how is the Internet changing the way we do research?...

Rationally Speaking #56 - Howard Schneider on Science News Literacy
M & J discuss science communication with Howard Schneider, dean of the school of journalism at SUNY Stonybrook and former editor of Newsday. A guest at previous skeptic events, including the first annual Northeast Conference on Science and Skepticism, Schneider has argued in the past that skeptics lay too much blame at the feet of the media for public misunderstandings and misconceptions about science. Julia and Massimo question him on this point, and ask him for his thoughts on what *can* be done to improv...


Rationally Speaking #55 - Spirituality
Is "rational spirituality" a contradiction? In this episode, Massimo and Julia try to pin down what people mean when they call themselves "spiritual," what inspires spiritual experiences and attitudes, and whether spirituality can be compatible with a naturalist view of the world. Are there benefits that skeptics and other secular people could possibly get from incorporating some variants on traditional spiritual practices -- like prayer, ritual, song, communal worship, and so on -- into their own lives? Ma...

Rationally Speaking #54 - The 'isms' Episode
n this episode Massimo and Julia ask, "Is the fundamental nature of the world knowable by science alone?", looking at the issue through the lenses of a series of related philosophical positions: determinism, reductionism, physicalism, and naturalism. All of those "isms" take a stance on the question of whether there are objectively "correct" ways to interpret scientific facts -- like physical laws, or causality -- and if so, how do we decide what the correct interpretation is? Along the way, Massimo and Jul...

Rationally Speaking #53 - Parapsychology
In this episode, Massimo and Julia take on parapsychology, the study of phenomena such as extrasensory perception, precognition, and remote viewing. Its practitioners claim that there is more evidence for it than there is for other areas of scientific inquiry, such as string theory for which there is no empirical data at all. Yet string theory is taken seriously as a science whereas parapsychology is not. So, what is the scientific status of parapsychology? What does the best academic literature on the subj...


Rationally Speaking #52 - Donald Prothero on the Holocaust-Deniers' Playbook
Guest Donald Prothero joins us to discuss the common tactics and thinking of science deniers and the implications of this assault on science for our future. The denial of scientific realities in issues like global warming, creationism, vaccine safety, and AIDS, is growing in our society. Not only is our acceptance of scientific "inconvenient truths" under attack, but even scientists themselves have been threatened. Donald R. Prothero is Professor of Geology at Occidental College and Lecturer in Geobiolog...

Rationally Speaking #51 - Joseph Heath on Economics Without Illusions
Guest Joseph Heath, author of “Economics Without Illusions: Debunking the Myths of Modern Capitalism,” joins us as we turn our skeptical eyes toward the treacherous dual terrain of economics and politics. We discuss the ways in which, with his book, he attempts to raise our economic literacy and empower us with new ideas. In it, he draws on everyday examples to skewer the six favorite economic fallacies of the right, followed by impaling the six favorite fallacies of the left. Heath leaves no sacred cows un...

Rationally Speaking #50 - Neurobabble
The media is increasingly bombarding us with reports of advances in neuroscience which claim all sorts of amazing feats, like allowing us to read our thoughts and intentions. It sounds like neurobabble. Most of these reports though are either based on bad science, reach false conclusion, or are based on conceptual misunderstanding of how our psychology works. To be fair, much of this is manufactured by the popular media but, unfortunately, some of it comes from the neuroscience community itself. So, what in...


Rationally Speaking #49 - Eugenie C. Scott on Denialism of Climate Change and Evolution
Our guest Eugenie C. Scott joins us to talk about a new initiative of the National Center for Science Education (NCSE) to tackle denialism of global warming. Both evolution and global warming are “controversial issues” in the public sphere, but are not controversial in the world of science. There is some overlap between the two issues, but far more people are climate change deniers than evolution deniers. What is interesting to skeptics, however, is the similarity in the techniques that are used by both cam...

Rationally Speaking #48 - Philosophical Counseling
Our guest Lou Marinoff joins us to discuss philosophical counceling, a recent trend to use philosophy as a type of talk therapy. Now, despite the provocative title of his best-selling book, “Plato, Not Prozac!: Applying Eternal Wisdom to Everyday Problems,” the idea is actually not to replace psychiatric medications with chats about the ancient Greeks. Rather, as he puts it in the introduction to the volume, you should take your medications if you really need them, but once your brain is back to a normal fu...

Rationally Speaking #47 - SETI
Is the search for extraterrestrial intelligence, or SETI, solid science, pseudoscience, or something else, as Massimo argues in his book "Nonsense on Stilts"? What are the theoretical foundations and empirical evidence that justify a multi-decade research program, and what are its chances of succeeding? Have we learned anything thanks to SETI? Also, if the universe is infinite, what problems does this pose for utilitarian ethics?...


Rationally Speaking #46 - The Varieties of Skepticism
All of us who are involved in the skeptics movement are regularly confronted with one of two reactions when revealing ourselves as skeptics: either that we are cynics, or that, like the classic skeptics, we don't believe that anything is knowable. In this episode, Massimo and Julia take us trough the history of skepticism. From its roots in ancient Greece, to Descartes, the last rationalist, to David Hume, the father of modern skepticism, and to today's modern skeptic movement. Also, is anything really know...

Rationally Speaking #45 - Rebecca Newberger Goldstein on Spinoza, Göedl, and Theories of Everything
Our guest Rebecca Newberger Goldstein joins us to talk about Baruch Spinoza and Kurt Gödel, the subjects of her books "The Proof and Paradox of Kurt Gödel" and "Betraying Spinoza: The Renegade Jew who Gave Us Modernity." The topics include the idea of "Spinoza's God" and his concept of a theory of everything, their views on the limits of reason and objective reality, Gödel's theorems and its repercussions in philosophy and mathematics, and his legendary friendship with Albert Einstein. She also talks abou...

Rationally Speaking #44 - Fluff that Works
In this episode we tackle the curious case of pseudoscience or mysticism that works, or seems to, at least some of the times. From acupuncture to chiropractic, from yoga to meditation, what do we make of instances where something seems to have the desired effect for the wrong reasons (e.g., acupuncture), or might otherwise be a perfectly acceptable technique which happens to come intricately bundled with mysticism (e.g., yoga)?...


Rationally Speaking #43 - Women in Skepticism
No, this episode is not about "elevatorgate" or the Watson-Dawkins debacle, but we do use these recent (in)famous events as a springboard for a broader discussion of women in skepticism and science. Is there a misogyny problem in the skeptic and atheist communities? Why aren't there more more women involved in these communities? Also, Julia tells us about her own experience as a young woman skeptic....

Rationally Speaking #42 - On the Limits of Reason
Following up on their interview with Robert Zaretsky on the dispute between David Hume and Jean-Jacques Rousseau about the limits of reason, Julia and Massimo expand the topic to include a discussion of the failure of “foundational” projects (e.g., the quest for the ultimate bases of scientific reasoning, or of logic and mathematics). Also, our take on a recent paper on the evolutionary psychology of reasoning that has made mainstream news....

Rationally Speaking #41 - Robert Zaretsky on Rousseau, Hume, and the Limits of Human Understanding
Imagine a time when a dispute between two philosophers was the talk of high society. That is the time that our guest, Robert Zarertsky, describes in his book "The Philosophers' Quarrel: Rousseau, Hume, and the Limits of Human Understanding." He tells the story of the short and dramatic friendship between Hume and Rousseau. Hume, who championed the progress of the sciences and arts, and Rousseau, who questioned progress, wondering whether it was just another word for moral decay and despair. He also discusse...


Rationally Speaking #40 - Q&A With Massimo and Julia
Massimo and Julia answer listeners' questions. In this installment the topics include: what would they teach in a class in critical thinking, their view of analytics vs. continental philosophy, the ethics of profiteering from a drought in examplistan, how do they compartmentalize their rationality, how does modern technology affect the way we think about things, and what is or should be the primary purpose of our species. Also, is there really a rational argument to prove the divine origin of the bible?...

Rationally Speaking #39 - The Science and Philosophy of Free Will
In this episode we tackle the never ending debate about free will, which David Hume famously defined as “a power of acting or of not acting, according to the determination of the will.” We do this with a couple of twists. We begin by examining the concept of free will from the standard philosophical perspective, then ask what — if anything — modern neuroscience can tell us about it, and come back to the interface between philosophy and science to explore how the two approaches may complement each other....

Rationally Speaking #38 - Holden Karnofsky on Evidence-based Philanthropy
Our guest Holden Karnofsky joins us to discuss Givewell, the nonprofit organization he founded. Givewell is devoted to investigating charities and NGOs to determine how much of an impact they’re having. You could call it “evidence-based philanthropy.” He discusses how Givewell evaluates charities, and what the research has to say about various controversies as well as the conventional wisdom in the nonprofit world: Can large charities be efficient? Is the percentage of the donation that goes to expenses rea...


Rationally Speaking #37 - The Science and Philosophy of Happiness
Debates over what’s important to happiness — Money? Children? Love? Achievement? — are ancient and universal, but attempts to study the subject empirically are much newer. What have psychologists learned about which factors have a strong effect on people’s happiness and which don’t? Are parents really less happy than non-parents, and do people return to their happiness “set point” even after extreme events like winning the lottery or becoming paralyzed? We also tackle some of the philosophical questions reg...

Rationally Speaking #36 - Why Should We Care About Teaching the Humanities?
Universities all around the country are closing programs in the humanities, at least in part because of the increasing widespread attitude that higher education should be treated as a business, and that programs that bring in money in the form of high tuitions from students and external grants are to be prioritized. SUNY Albany, for example, announced in the Fall of 2010 that the departments of French, Italian, Classics, Russian and Theater Arts were being eliminated. So, what is the point of studying langu...

Rationally Speaking #35 - What is Philosophy of Science Good for?
In this episode we explore philosophy of science: What is it about, and should it matter to scientists? Massimo and Julia also discuss some of the most important questions in philosophy of science now, and some historical debates between leading philosophers of science, like Thomas Kuhn and Karl Popper, over how science should or does work. So is philosophy of science, as Richard Feynman famously quipped, "as useful to scientists as ornithology is to birds?" Or was philosopher Daniel Dennett closer to ...


Rationally Speaking #34 - Celebrities and the Damage They Can Do
If the recent hoopla about the royal wedding wasn’t enough to remind you, we live in a culture of celebrity, one where famous people command our attention and often pontificate on things they know nothing about. Obvious examples include the nonsense spewed out by Prince Charles about alternative medicine, and the former model Jenny McCarthy and her dangerous notion that vaccines are harmful because they cause autism. But these, of course, are easy targets. What are we to make of Ray Kurzweil (he of Singular...

Rationally Speaking #33 - Live at NECSS: New Dilemmas in Bioethics
In this one hour episode, recorded live at the 2011 Northeast Conference on Science and Skepticism, Massimo and Julia discuss bioethics with two special guests: Jacob Appel, doctor, author, lawyer and bioethicist; and Jennifer Michael Hecht, poet and historian of science. Topics covered included: Should parents be allowed to select the gender and sexual orientation of their babies? Should pharmacists and physicians be allowed to refuse to provide treatments that violate their own religious or ethical princi...

Rationally Speaking #32 - Value-free Science?
We all think that science is about objectivity and “just the facts, ma’am.” Not so fast, philosophers, historians and sociologists of science have been arguing now for a number of decades. To begin with, there are values embedded in the practice of science itself: testability, accuracy, generality, simplicity, and the like. Then there are the many moral dimensions of science practice, both in terms of ethical issues internal to science (fraud) and of the much broader ones affecting society at large (soc...


Rationally Speaking #31 - Vegetarianism
Vegetarianism is a complex set of beliefs and practices, spanning from the extreme “fruitarianism,” where people only eat fruits and other plant parts that can be gathered without “harming” the plant, to various forms of “flexitaranism,” like pollotarianism (poultry is okay to eat) and pescetarianism (fish okay). So, what does science have to say about this? What is the ethical case for vegetarianism? And, is it true that vegetarians are more intelligent than omnivores? Not unexpectedly, the answers are com...

Rationally Speaking #30 - Cordelia Fine on Delusions of Gender
Cordelia Fine joins us from Melbourne, Australia to discuss her book: "Delusions of Gender: The Real Science Behind Sex Differences." Sex discrimination is supposedly a distant memory, yet popular books, magazines and even scientific articles increasingly defend inequalities by citing immutable biological differences between the male and female brain. That’s the reason, we’re told, that there are so few women in science and engineering and so few men in the laundry room — different brains are just better su...

Rationally Speaking #29 - Q&A Live!
In a continuation of episode 28, Massimo and Julia sit down for a Q&A session in front of a live audience at the Jefferson Market Library in New York City. The audience's questions include whether economics and evolutionary psychology are really science, what's the deal with the placebo effect, the influence of corporate money on scientific research, and how can some scientists publish legitimate research and still believe in pseudo-science. Also, vegetarianism: is it about science, ethics, or both?...


Rationally Speaking #28 - Live! How To Tell Science From Bunk
Massimo and Julia sit down in front of a live audience at the Jefferson Market Library in New York City for a conversation about science, non-science, and pseudo-science. Based on Massimo's book: "Nonsense on Stilts: How to Tell Science from Bunk" the topics they cover include whether the qualitative sciences are less reliable than quantitative ones, the re-running of the tape of life, and who is smarter: physicists, biologists, or psychologists? Also, why are evolutionary psychologist so fixated on sex? ...

Rationally Speaking #27 - The Perihelinox Episode, With Historian Timothy Alborn on Anniversaries
In honor of our first anniversary we invited Historian Timothy Alborn to help us understand the arbitrary nature of anniversaries, both those that mark events of personal significance and those that have a wider societal impact. We chose to record this episode on a very special "holiday": Perihelinox. If you've never heard of it it's because it was recently made up by our producer, Benny Pollak, to celebrate the night of the year when the earth is closest to the sun. Nothing is sacred in this episode, from ...

Rationally Speaking #26 - Is Anthropology Still a Science?
In a recent article in the New York Times, Nicholas Wade reported that the American Anthropological Association had decided “to strip the word ‘science’ from a statement of its long-range plan.” Is this just a reflection of the long standing division between physical and cultural anthropology or is there more here? The revised statement says that “the purposes of the association shall be to advance public understanding of humankind in all its aspects,” a wording that opens the possibility for cultural anthr...


Rationally Speaking #25 - Q&A With Massimo and Julia
Massimo and Julia answer listeners' questions, as they try to stay away from politics. In this installment the topics include: is quantitative research more scientific than qualitative one, can philosophers really claim to have expertise on something, is skepticism just another name for intelligence, what about feminist philosophy, bayesian reasoning, and what are M&J's anti-akracia strategies?...

Rationally Speaking #24 - Memetics!
The term meme was introduced by Richard Dawkins in his 1976 bestseller "The Selfish Gene."Dawkins was trying to establish the idea that Darwinian evolution is a universal, almost logically necessary phenomenon. He couldn't, however, point to exobiological examples to reinforce the concept of universal Darwinism, so he turned to cultural evolution, renamed “ideas” as “memes” (in direct analogy with genes), and voilà, the field of memetics was born. Despite staunch support by authors such as Susan Blackmor...

Rationally Speaking #23 - Carol Tavris on Everybody Making Mistakes, Except Us...
Our guest, Carol Tavris discusses her book (co-authored with Elliot Aronson) "Mistakes Were Made (But Not by Me): Why We Justify Foolish Beliefs, Bad Decisions, and Hurtful Acts." In it they describe how our powerful cognitive dissonance engine of self-justification gives us the incredible ability to rationalize events and beliefs so that we always end up being better than average at being right. Also, how we are forced into these rationalizations by our absolute need to somehow square our most dearly hel...


Rationally Speaking #22 - Steven Novella on Lies, Damned Lies, and Medical Science
Our Guest, Dr. Steven Novella discusses a recent article in The Atlantic in which researcher John Ioannidis shows that 40% of papers published in top medical journals are either wrong or make exaggerated claims (and those are the top journals!). He also discusses the difference between Science and Evidence based medicine. Also, Zombies: are they epidemiologically possible? Steven Novella is an academic clinical neurologist at the Yale University School of Medicine. He is the host of the Skeptics Guide t...

Rationally Speaking #21 - Joshua Knobe on Experimental Philosophy
Our guest, Joshua Knobe, is a philosopher interested in cognitive science, so interested, in fact, that he has contributed to establishing a whole new branch of inquiry known as experimental philosophy — and he plausibly claims that the name is not actually an oxymoron! The idea is summarized in this way on one of the major web sites devoted to the enterprise: "Experimental philosophy, called x-phi for short, is a new philosophical movement that supplements the traditional tools of analytic philosophy wi...

Rationally Speaking #20 - Q&A With Massimo and Julia
Massimo and Julia answer listeners' questions. In this installment the topics include: can political discourse be rational, who changed M&J's opinion on something and when have they changed someone's opinion, how do they guard against biases when they debate people, the morality of bestiality, and did Samir Okasha really solve the induction problem? Plus, M&J's favorite sources for philosophy: - Internet Encyclopedia of Philosophy - Stanford Encyclopedia of Philosophy - philpapers.org - An Enquiry ...


Rationally Speaking #19 - Brendan Nyhan on False Beliefs that Refuse to Die
Ever notice how some beliefs only seem to become stronger, even as they're repeatedly debunked? For example, the belief that Barack Obama is a Muslim, or that Bush banned all stem cell research in the country. Brendan Nyhan tells about what he's learned from his research studies and his experience maintaining Spinsanity, a watchdog blog monitoring political misinformation. Is there any hope of clearing up false beliefs if denials simply make the problem worse? Brendan does offer hope, but it won't be easy. ...

Rationally Speaking #18 - Evolutionary Psychology
You’ve heard the claims: men are inclined to cheat on women because natural selection favors multiple offspring from multiple mates, especially if you don’t have to pay child support. Even rape has been suggested to be the result of natural selection in favor of “secondary mating strategies” when the primary ones fail. Welcome to evolutionary psychology, a discipline curiously situated at the interface between evolutionary science and pop psychology, where both wild and reasonable claims seem to clash again...

Rationally Speaking #17 - Transhumanism
What's so great about being human, anyway? The transhumanist movement -- epitomized by organizations like Humanity+ and blogs like Accelerating Future -- advocate the pursuit of technologies to fundamentally change the human condition, tinkering with our brain, bodies and genomes to make ourselves smarter, stronger, happier, and longer-lived. But many people worry that tampering with human nature could have dire consequences for individuals and society alike. In Our Posthuman Future, political theorist F...


Rationally Speaking #16 - Deferring to Experts
At a talk he gave at TAM 8, Massimo argued that non-experts in a field aren't qualified to reject an expert consensus, such as that on anthropogenic climate change. Most recently, he has taken Jerry Coyne to task for making a philosophical argument without having the necessary expertise. This raises a number of questions: Are there fields that have no experts, or that have pretend experts? If there is a lot of disagreement among experts on a topic, should we take any individual expert's opinion less serio...

Rationally Speaking #15 - Q&A With Massimo and Julia
In the first of what we hope will be a regular feature of Rationally speaking, Massimo and Julia answer listeners' questions. These range from what are M & J's sacred cows, to how we should approach morally repugnant claims made by venerated philosophers, to whether we are deluding ourselves believing that our votes count....

Rationally Speaking #14 - Jennifer Michael Hecht on Science, Religion, Happiness, and Other Myths
Author, science historian, philosopher, and poet Jennifer Michael Hecht discusses her views on science, religion, and skepticism. She talks about her book "The Happiness Myth", showing how the very concept of happiness has changed dramatically both in time and across cultures, to the point that it may make little sense to simply ask “are you happy”? Also she makes her skeptical comments on the findings of science, for instance concerning eating and exercise habits, and how the skeptic community's reliance ...


Rationally Speaking #13 - Superstition, Is It Good For You?
Is it possible that superstition is actually good for you? Well, it turns out that superstition may, at least some of the time, have beneficial effects. A paper published in 2008 in Science for example, suggests that lacking control over a situation increases people’s propensity to see illusory patterns — the implication being that the latter (a typical component of superstition) ameliorates stress when we feel that things are out of hand. Also, a recent study published in Psychological Science shows that...

Rationally Speaking #12 - What About Thought Experiments?
Philosophers are often accused of engaging in armchair speculation, as far removed from reality as possible. The quintessential example of this practice is the thought experiment, which many scientists sneer at precisely because it doesn’t require one to get one’s hands dirty. And yet scientists have often engaged in thought experiments, some of which have marked major advances in our understanding of the world. Just consider the famous example of Galileo’s thought experiment demonstrating (rather counter i...

Rationally Speaking #11 - Guest Eugenie Scott on the Status of the Creationism and ID Wars
Our special guest this episode is Eugenie Scott, executive director of the National Center for Science Education, the premiere organization fighting for sound scientific educational standards in this country, and a permanent thorn in the ass of creationists and IDers nationwide. Genie updates us on the status of the ID and creationist wars, as well as other issues related to the intrusion of religion in science education. We also recount how, in what may be a very rare event, Genie made Massimo change ...


Rationally Speaking #10 - Nonsense on Stilts
The focus of this episode is Massimo's new book, Nonsense on Stilts: How to Tell Science from Bunk. The book, broadly speaking, is about what philosopher Karl Popper famously called the demarcation problem: how do we tell the difference among science, non-science and pseudoscience? We explore the complex relationship among these, ranging from solid science like fundamental physics and evolutionary biology to definite pseudosciences like astrology and creationism. In the middle are the more interesting bord...

Rationally Speaking #9 - When Smart People Endorse Pseudoscience
It’s very easy to make fun of not-so-educated people who reject evolution, but what happens when one of the most prominent contemporary philosophers, Jerry Fodor, writes a book about “What Darwin Got Wrong”? Similarly, we can dismiss extreme right wing politician like Senator Jim Inhofe of Oklahoma, who thinks global warming is a worldwide conspiracy of crazy scientists bent on destroying the American way of life. But what happens when two icons of the skeptic movement, Penn & Teller, do a whole show in whi...

Rationally Speaking #8 - The Anthropic Principle
The Anthropic Principle (AP), in its many forms, attempts to explain why our observations of the physical universe are compatible with the life observed in it. From the Weak AP (WAP), which in one form states that "conditions that are observed in the universe must allow the observer to exist", to the Strong AP (SAP) which in one version states that: “The Universe (and hence the fundamental parameters on which it depends) must be such as to admit the creation of observers within it at some stage,” they all ...


Rationally Speaking #7 - Peter Woit discusses whether string theory is “not even wrong”
We are taking on fundamental physics! Our guest, Peter Woit, is a physicist in the Department of Mathematics at Columbia University and author of "Not Even Wrong: The Failure of String Theory and the Search for Unity in Physical Law." We discuss the apparently peculiar state of theoretical physics and the rather startling possibility that superstring theory — the best candidate in decades as the elusive “theory of everything” — may actually have been a colossal dead end for the physics community. We also ex...

Rationally Speaking #6 - Fluffy Thinking
Fluffy Thinking is a peculiar type of uncritical thinking that sounds sophisticated, and is next to impossible to criticize frontally both because it barely has anything to do with empirical evidence, and because it is hard to articulate what, exactly, these people are saying. These people include scientific luminaries like Freeman Dyson and Paul Davies. Also, Karen Armstrong, author of "The Case for God", and Krista Tippett, author of "Einstein's God" and host of National Public Radio's "Speaking of Faith"...

Rationally Speaking #5 - Neil deGrasse Tyson and the Need for a Space Program
Dr. Neil deGrasse Tyson joins Massimo and Julia to discuss the need for a space program. Many scientists (and most people in the skeptic community) simply assume that funding outlets like NASA are a good idea. But, can scientists justify the enormous expense involved, not just in terms of their personal curiosity, but as a matter of tangible and intangible benefits to society at large? Should we go back to the Moon and establish a permanent base? Is it worth the expense and likely risk to human life to atte...


Rationally Speaking #4 - The Great Atheist Debate Over the Limits of Science
"Accommodationist" is a word that began to appear in recent months during public debates over science and religion. The derogatory term has been applied to atheists and rationalists like Eugenie Scott, at the National Center for Science Education, and Chris Mooney, science writer at Discover Magazine, who maintain that science and faith are not necessarily incompatible. Although the debate is frequently framed as a practical one, about what the tactics of the secular movement should be, it is also a philoso...

Rationally Speaking #3 - Can History Be a Science?
Our guest, Prof. Peter Turchin from the University of Connecticut, joins Massimo and Julia to discuss whether history can be studied and understood in a scientific manner. In an article in Nature (3 July 2008) on what he termed “cliodynamics,” he discusses the possibility of turning history into a science. In it, he proposes that history, contrary to what most historians might think -- is not just one damn thing after another, that there are regular and predictable patterns, from which we can learn and th...

Rationally Speaking #2 - Love, a Skeptical Inquiry
Will science ever really be able to explain love? Science has already found correlations between particular hormones and certain forms or stages of love. However, no matter how many correlations we find between brain activity and love, correlation does not imply causation. And what does it mean to explain love scientifically -- would that change our attitude towards it? We realize that raising this subject risks fueling the widespread and irritating misconception that “skeptic” = “cynical killjoy,” which i...


Rationally Speaking #1 - Why be rational?
Why is "speaking rationally" a worthwhile goal anyway? It’s not self-evident, at least not to many people. Human beings certainly don’t seem made for it. Aristotle may have famously dubbed us "the rational animal," but cognitive science tells a different story, with plenty of evidence that our brains blithely flout logic all the time and are excellent at rationalizing our irrational decisions after the fact. Indeed, it is reasonable to ask why fight our irrational natures to begin with? After all, some argu...