If you say you never lie, you're probably lying. We all lie, a little bit, even if it's just about very small, insignificant things: "Of course you look great in that dress!" or, "No, officer, I had no idea how fast I was going." Dan Ariely is a behavior economist whose new book is "The (Honest) Truth About Dishonesty." In this talk, recorded June 15, 2012 at Seattle's Town Hall, Ariely examines the opposing forces that drive us to lie while keeping us honest. He says this behavior is irrational, but entirely human.