Our guest this week is Stephen Dubner. Stephen’s an award-winning author, journalist, and TV and radio personality. He’s co-author of the Freakonomics books, which have sold millions of copies in 40 languages, and he’s host of Freakonomics Radio, which gets 8 million global monthly downloads and is heard by millions more on N.P.R. stations and other radio outlets around the world. You can follow him on Twitter @Freakonomics. For show notes visit: