what psychologist Paul Ekman called the “Duchenne smile”—a sign of unself-conscious pleasure that involves the muscles around the eyes as well as those around the lips. Susan giggles and laughs at his banter, though she’s not supposed to say anything when he speaks. She flips her hair, cocks her head, plays with her earring, and leans forward in her chair—a tactic, explains social psychology and consumer-marketing researcher Kristina Durante, who’s running this experiment, “to draw attention to her chest,” even when he’s talking and she knows he can’t see her.
