What drives us to make the decisions that we do? Why do we still feel pain after taking a cheaper aspirin, but feel better after a more expensive one? Why do we splurge on a big meal and cut coupons the next day? Psychology professor Dan Ariely is the author of "Predictably Irrational" is on the show this week. Join him and Francesca to discover how human beings may not be as rational as we like to believe.