In this startling study of human emotion, Dacher Keltner investigates an unanswered question of human evolution: If humans are hardwired to lead lives that are nasty, brutish, and short, why have we evolved with positive emotions like gratitude, amusement, awe, and compassion that promote ethical action and cooperative societies? Illustrated with more than fifty photographs of human emotions,A bright, entertaining book . . . [that] covers broad, interesting territory.A fact-filled, fun, and enlightened peek into our minds and hearts.A fresh and absolutely fascinating book.A landmark book in the science of emotions and its implications for ethics and human universals.