Henry Louis Gates Jr. points to post-Civil War Reconstruction as the genesis of white supremacy, as white Southerners looked for ways to roll back the newly acquired rights of African-Americans. His new book is 'Stony the Road.'Rob Delaney, the co-creator, co-writer and co-star of the Amazon comedy series 'Catastrophe,' talks about his experience writing the fourth season with Sharon Horgan while grieving the death of his young son. Though working on 'Catastrophe' didn't lessen or distract Delaney from his grief, he says he found grief and work "compatible" in that work gave him the structure he needed to "approximate normal behavior." He spoke with 'Fresh Air' producer Sam Briger.