Exploring Time as a Landscape: The Quantum Mechanics of Parallel Universes

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Time seems natural and absolute: the flow of moments one following another from the unknown past to the knife's edge present to the unknowable future. But this is not so. Einstein shocked the world by showing that time was "relative." What's the latest about time?

Featuring interviews with Gregory Benford, Kip Thorne, Nima Arkani-Hamed, and Lee Smolin.