Pollan discusses the history of psychedelic drugs, including LSD and magic mushrooms, and explains how they're currently being used experimentally in therapeutic settings to treat depression, addiction, and fear of death. The author experimented with psychedelics for research. "I had an experience that was by turns frightening and ecstatic and weird," he says. 'How To Change Your Mind' is now out in paperback. Also, critic John Powers reviews 'Booksmart,' a film about two brainy girls who are desperate to party with the cool kids in the final 24 hours before high school graduation.