Phil Zuckerman joins John and Seamus to discuss his new book "What It Means to Be Moral: Why Religion Is Not Necessary for Living an Ethical Life," and other great topics. Phil Zuckerman argues that morality does not come from God. Rather, it comes from us: our brains, our evolutionary past, our ongoing cultural development, our social experiences, and our ability to reason, reflect, and be sensitive to the suffering of others.