Abigail Marsh, an associate professor of psychology and neuroscience at Georgetown University, finishes a presentation on “The Altruistic Brain” at a special luncheon held June 12, 2018, at the Allegheny HYP Club in downtown Pittsburgh as part of the celebration of 10,000 Carnegie heroes. Marsh authored The Fear Factor, which explores the extremes on human nature ranging from extraordinary altruism to psychopathy.