No part of the human body has generated more folklore, mythology, and popular belief about its ability to reveal truth than the eyes. “The eyes don’t lie,” “look me in the eye when you say that,” “I could see it in her eyes,” these are cultural expressions of a genuine underlying reality: the eyes do reveal enormous amounts of information about internal state, emotional experience, and cognitive processing. But the popular understanding of eye behavior is riddled with myths that make people worse at reading eyes than they would be without any assumptions at all. Reading eyes accurately requires dismantling...