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The multiverse hypothesis, suggesting that our universe is but one of perhaps infinitely many, speaks to the very nature of reality. Physicist Brian Greene, cosmologists Alan Guth and Andrei Linde, and philosopher Nick Bostrom discuss and debate this controversial implication of forefront research and explore its potential for redefining the cosmic order. Moderated by Robert Krulwich and featuring an original musical interlude, inspired by parallel worlds, by DJ Spooky. Subscribe to our YouTube Channel for all the latest from WSF. Visit our Website: http://www.worldsciencefestival.com/ Like us on Facebook: https://www.facebook.com/worldsciencefestival Follow us on twitter: https://twitter.com/WorldSciFest Participants: Alan Guth, Brian Greene, Andrei Linde, Paul D. Miller, Nick Bostrom Original Program Date: June 13, 2009 Introduction with Brian Greene 00:39 Musical interlude 25:15 Participant Introductions 33:49 How do we know there was a Big Bang 35:50 How do we get from a single universe to a multiverse. 47:14 Is the universe expanding and how fast? 01:00:25 What does six dimensional space look like? 01:08:00 How do we know there is a multiverse? 01:13:48 Bryce DeWitt on the multiverse concept 01:24:40 What if we assume the universe is the simulation hypothesis? 01:37:14 This program is part of The Big Idea Series, made possible with support from the John Templeton Foundation.