The psychologist Roy Baumeister has been a pioneer in the study of the key adaptive trait of self-control. His research has yielded the insight that self-control is akin to a form of physical energy, which can be depleted through overuse. Baumeister’s article in the April Scientific American, “Conquer Yourself, Conquer the World,” provides a concise summation of his work—and also an update on recent studies on the relationship of self-control needed to manage addiction to illicit drugs or cigarettes. Watch a video below of Baumeister talking about his work at a conference in Australia.