The most brilliant decisions tend to come from the gut. While that observation is not new, it is now backed by a growing body of research from economics, neurology, cognitive psychology, and other fields. What the science suggests is that intuition — or instinct, or hunch, or “learning without awareness,” or whatever you want to call it — is a real form of knowledge. It may be nonrational, ineffable, and not always easy to get in touch with, but it can process more information on a more sophisticated level than most of us ever dreamed. Psychologists now say that far from being the opposite of effective decision-making, intuition is inseparable from it. Without it we couldn’t decide anything at all.