Jon Ronson is an award-winning writer and documentary maker. He is the author of two previous bestsellers: "Them: Adventures with Extremists" and "The Men Who Stare at Goats," and two collections: "Out of the Ordinary: True Tales of Everyday Craziness" and "What I Do: More True Tales of Everyday Craziness." His latest book -- also a Sunday Times top ten bestseller -- is "The Psychopath Test."

This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at http://ted.com/tedx.