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Why Does Time Exist?

Part 5 of the TED Radio Hour episode Shifting Time

About Sean Carroll's TED Talk

Cosmologist Sean Carroll tackles a deceptively simple question: Why does time exist at all? The potential answers point to a surprising view of the nature of the universe, and our place in it.

About Sean Carroll

Sean Carroll is a theoretical physicist at California Institute of Technology, where he researches theoretical aspects of cosmology, field theory and gravitation. Carroll's book on cosmology and time, From Eternity to Here: The Quest for the Ultimate Theory of Time, was published in 2010. He keeps a regular blog at Cosmic Variance.

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