This provocative discussion between a psychologist and a journalist brings together two perspectives on the nature of evil — one that relies on psychological research, the other on interviews with followers of one of the most violent groups on earth. Yale cognitive scientist Paul Bloom, author of Just Babies and Against Empathy, draws upon his fascinating research on the origins and nature of human morality, and Atlantic correspondent Graeme Wood discusses his in-depth study of the men and women who feel the pull of ISIS, published in his recent book, The Way of the Strangers: Encounters with the Islamic State.