What drives human behavior? Why do we do what we do? Is free will an illusion? Has civilization made us better? Can we escape our tribal past? These questions are the subject of Stanford biology professor Robert Sapolsky's new book Behave: The Biology of Humans at Our Best and Worst. Watch him as he explores why we are the way we are and explains why we ultimately do the things we do…for good and for ill.Robert Sapolsky is a Professor of Biological Sciences and Professor of Neurology and Neurological Sciences at Stanford University, and a research associate with the Institute of Primate Research at the National Museum of Kenya. As a neuroendocrinologist, he has focused his research on issues of stress and neuron degeneration, as well as gene therapy strategies to help protect susceptible neurons from disease. A MacArthur Fellow, Sapolsky has been called "one of the best scientist-writers of our time" by Oliver Sacks and "one of the finest natural history writers around" by the New York Times. His books include A Primate's Memoir, The Trouble with Testosterone, Why Zebras Don't Get Ulcers, and Monkeyluv: And Other Essays on Our Lives as Animals.