Is the brain rational? The provocative question is posed by the renowned brain researcher and neuropsychologist Lutz Jäncke for good reason: We all believe that we, as humans, make rational decisions. Our brain acts as a kind of supercomputer, helping us weigh the pros and cons in a strictly logical manner. But we are mistaken! The more we learn about how this thinking organ functions, the more plausible the question becomes of how rational we truly are. Lutz Jäncke takes us on a fascinating journey and shows in an understandable and entertaining way how our brain influences our thinking, actions, and feelings – and that this sometimes has little to do with reason. He demonstrates that the unconscious truly exists and how it affects us, how we make right and wrong decisions, and how our memory works.