An expert in nonverbal communication tackles the science of smiles and their extraordinary social impact. When someone smiles, the effects are often positive: a glum mood lifts; an apology is accepted; a deal is struck; a flirtation begins. But not all smiles are equally benign: a rival grins to get under your skin; a bully's smirk unsettles his mark. Who flashes more fake smiles, popular kids or unpopular kids? Is it good or bad when a bereaved person smiles? Much more than cheerful expressions, smiles are social acts with powerful consequences. Drawing on her research conducted at Yale University and Boston College as well as the latest studies in psychology, medicine, anthropology, biology, and computer science, Marianne LaFrance explores the compelling science behind the smile, revealing that this familiar expression is not as simple as it first may seem. Her groundbreaking work shows how the smile says much more than we realize—or care to admit. To read this book is to learn just how much the smile influences our lives and our relationships. 38 black-and-white illustrations