What is truth? What kind of person is it good to be? What do we know and how do we know it? For thousands of years, philosophers have endeavored to answer such questions. Introducing some of these major thinkers, this profusely illustrated overview explains the contributions of Aristotle, Plato, Zeno, Pythagoras, Confucius, Lao Tzu, Hegel, Marx, Descartes, Kant, Kierkegaard, and Wittgenstein, among others.