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        Riddles of the Multiverse

        While the idea remains hotly debated, some of the brightest minds in contemporary physics take very seriously the possibility that our universe is just one among many. How did this notion of multiple universes -- a multiverse -- arise? Could we ever cross over to other universes, and if we could, might we find another world identical to our own? In this interview from NOVA Online, Clifford Johnson, Professor of Physics and Astronomy at the University of Southern California, offers his perspective on truly otherworldly ideas that science is just beginning to tackle.

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