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Sean Carroll: Distant time and the hint of a multiverse

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Uploaded on May 6, 2011

http://www.ted.com At TEDxCaltech, cosmologist Sean Carroll attacks -- in an entertaining and thought-provoking tour through the nature of time and the universe -- 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.

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