Our guest on this episode is Dr. Abigail Marsh, author of, "The Fear Factor: How One Emotion Connects Altruists, Psychopaths, and Everyone In-Between".  It's about the factors that make some of us angels, some of us devils, and all of us human.  She is a Professor in the Department of Psychology and the Interdisciplinary Neuroscience Program at Georgetown University. Her website is https://abigailmarsh.com/