Are we in control of our own decisions? Behavioral economist Dan Ariely, the author of Predictably Irrational, uses classic visual illusions and his own counter-intuitive research findings to show how we're not as rational as we think when we make decisions. (To play, click on the pic)

On the surprising science of motivation - Dan Pink examines the puzzle of motivation, starting with a fact that social scientists know but most managers don't: Traditional rewards aren't always as effective as we think. (To play, click on the pic)