Why do we feel the way we feel? How do our thoughts and emotions affect our health? Are our bodies and minds distinct from each other or do they function together as parts of an interconnected system? In her groundbreaking book Molecules of Emotion, Candace Pert - a neuroscientist whose extraordinary career began with her 1972 discovery of the opiate receptor - provides startling and decisive answers to these and other challenging questions that scientists and philosophers have pondered for centuries.