It is possible that there are many other universes that exist parallel to our universe. Theoretical physicist Brian Greene, author of The Elegant Universe, explains how that's possible in the new book, The Hidden Reality.
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Famed screenwriter Charlie Kaufman and theoretical physicist Brian Greene dissect time as we know it. What is the smallest unit of time, and what does it look like? For starters, you should stop looking at the clock, and start looking at the universe.