Leonard Mlodinow, the best-selling author of The Drunkard’s Walk and coauthor of The Grand Design (with Stephen Hawking), gives us a startling and eye-opening examination of how the unconscious mind shapes our experience of the world and how, for instance, we often misperceive our relationships with family, friends, and business associates, misunderstand the reasons for our investment decisions, and misremember important events. Your preference in politicians, the amount you tip your waiter—all judgments and perceptions reflect the workings of our mind on two levels: the conscious, of which we are aware, and the unconscious, which is hidden from us. The latter has long been the subject of speculation, but over the past two decades researchers have developed remarkable new tools for...