Moral philosophy lies at the heart of today’s most heated issues—abortion, human cloning, assisted suicide, financial conflicts of interest, and environmental stewardship. In this program, Harvard University’s Frances Kamm; Rutgers University’s Larry Temkin; and Richard Sorabji, honorary fellow at Wolfson College, the University of Oxford, describe the three major categories of ethics: metaethics; applied ethics; and normative ethics, including virtue theory, divine command theory, utilitarian theory, and duty theory. Plato’s Republic, Aristotle’s Nicomachean Ethics, Kant’s Grounding for the Metaphysics of Morals, and Mill’s Utilitarianism are considered, along with the contributions of Epicurus, Hume, Bentham, Hegel, Marx, Nietzsche, John Rawls, and others. (50 minutes)