World / Tim Crane -- What is reality? -- Aristotle -- The physical world -- The supernatural -- Cause -- Hume -- Idealism -- Berkeley -- Hegel -- Phenomenology -- Truth -- Mathematics -- The infinite -- Leibniz -- Time and space -- Mind and body / Jesse Prinz -- What is the mind? -- Descartes -- Thinking -- Fodor -- Consciousness -- Feelings and emotions -- Language -- Wittgenstein -- Free will -- Spinoza -- The self -- Sanity and insanity -- Life and death -- Knowledge / Adam Morton -- What is knowledge? -- Plato -- Perception and experience -- Locke -- Scepticism -- Relativism -- Foucault -- Quine -- Logic and reasoning -- Carnap -- Induction and deduction -- Bacon -- Diderot -- Science -- Rationality -- Common sense -- Pragmatism -- Wisdom -- Faith / John Cottingham -- Is there a God? -- Aquinas -- Faith and reason -- Augustine -- Miracles -- The afterlife -- Pascal -- Atheism and agnosticism -- Pain and evil -- Voltaire -- Kierkegaard -- The meaning of life -- Ethics and aesthetics / Brenda Almond -- What is morality? -- Stoicism -- Mill -- Kant -- Lying -- Conscience -- Altruism and egoism -- Responsibility -- Moral absolutes -- Nietzsche -- Existentialism -- Sartre -- Goodness -- Love and friendship -- Sex -- Reproduction -- Animals -- Technology and nature -- Beauty -- Schopenhauer -- Art -- Taste and decency -- Society / Jonathan Woolf -- What is society? -- Authority -- Hobbes -- Democracy -- Rousseau -- Freedom -- Tradition -- Rights -- Laws -- Bentham -- Crime and punishment -- Social justice -- Rawls -- Equality -- Ownership -- Rich and poor -- Marx -- Globalization -- War.