Dan Ariely   Why do our headaches persist after taking a one-cent aspirin but disappear when we take a 50-cent aspirin?Why does recalling the Ten Commandments reduce our tendency to...

Dan Ariely   Dan Ariely, behavioral economist and the New York Times bestselling author of The Upside of Irrationality and Predictably Irrational, examines the contradictory forces that drive us to...