Jena Pincott

Most of us live in fear of unleashing a Freudian slip. Do you?

Sometimes you can judge a book by its cover. Appearance predicts behavior in surprising ways—some of the time. The connection between looks and personality is the ultimate chicken-or-egg question. And it plays out on every face you meet.

Do you play a little hooky, fudge on your taxes, or cheat on exams? You're not alone. Many people break the rules now and then. Here's the science behind our everyday transgressions.