Although numerous books and articles have recently talked about the gut instincts as valuable in giving us useful hunches in the decision-making process, "What's Behind Your Belly Button?" goes much further and explains how gut feelings not only have a psychological intelligence of their own, but are also understandably rational in their functioning. The authors explore how gut feelings are like a gas gauge in our guts indicating through an emotional feeling of emptiness or fullness how well the two instinctive human needs for acceptance (attention from others) and of control of one's own...