In the wake of his enormously popular books The Armchair Economist and More Sex Is Safer Sex , Slate columnist and Economics professor Steven Landsburg uses concepts from mathematics, economics, and physics to address the big questions in philosophy: What is real? What can we know? What is the difference between right and wrong? And how should we live? Landsburg begins with the broadest possible categories from a mathematical analysis of the arguments for the existence of God; to the real meaning of the Heisenberg Uncertainty Principle and the Godel Incompleteness Theorem; to the moral choices we face in the marketplace and the voting booth. Stimulating, illuminating, and always surprising, The Big Questions challenges readers to re-evaluate their most fundamental beliefs and reveals the relationship between the loftiest philosophical quests and our everyday lives.