Allan Hamilton, MD, is a Harvard-trained brain surgeon, a decorated Army veteran, and Regents Professor of Surgery at the University of Arizona as well as a life-long horse trainer. His next book on the human brain is Cerebral Entanglements—How the Brain Gives Value and Meaning to Our Private and Public Lives, to be published by Knopf in the Spring of 2024. Learn more about your ad choices. Visit megaphone.fm/adchoices