How To Think Like A Freak: Say "I Don't Know"

Stephen Dubner, host of the Freaknomics podcast and co-author (with Steven Levitt) of Think Like A Freak (HarperCollins, 2014), joins The Brian Lehrer Show for a three-part series about retraining your brain to "think like a freak." Today, he'll explain why it's important to admit when you don't know the answer to a question, and the danger of predicting the future.