Chip a professor at Stanford's business school, Dan a teacher and textbook publisher-offer an entertaining, practical guide to effective communication. Drawing extensively on psychosocial studies on memory, emotion and motivation, their study is couched in terms of "stickiness"-that is, the art of making ideas unforgettable. They start by relating the gruesome urban legend about a man who succumbs to a barroom flirtation only to wake up in a tub of ice, victim of an organ-harvesting ring. What makes such stories memorable and ensures their spread around the globe?