Brian Greene is one of those physicists. You know the type: Blessed with a brain capable of untangling the mysteries of the universe,and a knack for clearly explaining it all to the rest of us schlubs. His enthusiasm for doing these things keeps him quite busy, what with the three best-selling physics books for grown-ups, a children’s book about time dilation(!), a fewTV specials, and, of course, a TED talk.

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