In the wake of Lance Armstrong’s long-awaited admission of doping, cheating has been on many peoples’ minds of late. Katie Couric was one of them. Last Friday Northeastern professor David DeSteno appeared on her show to discuss the psychology behind why we cheat. You can watch his segment in the video below. And for even more interactive fun, take the quiz to find out if you’re a cheater on Katie’s homepage. If you still want more, you can watch more clips from the episode here.