Salt Lake City, Utah – Monday, we're talking to physicist Brian Greene about this question: is our universe the only universe? Greene's latest book is called "The Hidden Reality," and he says that major scientific developments have opened the door to the possible existence of parallel universes. It may sound like something from science fiction, and the idea is controversial and speculative, but Greene's goal is to help us imagine how the boundaries of reality could one day be redrawn. (Rebroadcast)
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