The fact that no one knows the answer to this question is what makes it exciting. The story of physics has been one of an ever-expanding understanding of the sheer scale of reality, to the point where physicists are now postulating that there may be far more universes than just our own. Chris Anderson explores the thrilling implications of this idea. (Part of the series "Questions no one knows the answers to") "How Many Universes are There?" was animated by Andrew Park (http://www.cognitivemedia.co.uk)
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