Scientist and spiritual teachers alike agree that the simple act can transform you and the world around you. Current research (and common sense) shows us that a smile is contagious (1). It can make us appear more attractive to others. It lifts our mood as well as the moods of those around us. (Merci, Colette.) And it can even lengthen our lives (2). So before you read on, slap a nice, genuine smile on that face of yours. You’ll thank me later.