This compelling study of the origins of all that exists, including explanations of the entire material world, traces the responses of philosophers and scientists to the most elemental and haunting question of all: why is anything here--or anything anywhere? Why is there something rather than nothing? Why not nothing? It includes the thoughts of dozens of luminaries from Plato and Aristotle to Aquinas and Leibniz to modern thinkers such as physicists Stephen Hawking and Steven Weinberg, philosophers Robert Nozick and Derek Parfit, philosophers of religion Alvin Plantinga and Richard Swinburne, and the Dalai Lama. The first accessible volume to cover a wide range of possible reasons for the existence of all reality, from over 50 renowned thinkers, including Plato, Aristotle, Aquinas, Descartes, Leibniz, Hume, Bertrand Russell, Stephen Hawking, Steven Weinberg, Robert Nozick, Derek Parfit, Alvin Plantinga, Richard Swinburne, John Polkinghorne, Paul Davies, and the Dalai Lama  Features insights by scientists, philosophers, and theologians Includes informative and helpful editorial introductions to each section Provides a wealth of suggestions for further reading and research Presents material that is both comprehensive and comprehensible