Why do we so often fail to act in our own best interest? Why do we promise to skip the chocolate cake, only to find ourselves drooling our way into temptation when the dessert tray rolls around? What are the forces that influence our behavior? Dan Ariely, James B. Duke Professor of Psychology & Behavioral Economics at Duke University, is dedicated to answering these questions and others in order to help people live more sensible -- if not rational -- lives. Dan is also a founding member of the Center for Advanced Hindsight, and the author of the New York Times bestsellers Predictably Irrational, and The Upside of Irrationality.