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Brian Cox explains why time travels in one direction - Wonders of the Universe - BBC Two

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Published on Mar 10, 2011

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More about this programme: http://www.bbc.co.uk/programmes/b00zf9dh
Professor Brian Cox builds sandcastles in the Namib Desert to explain why time travels in one direction. It is a result of a phenomenon called entropy; a law of physics that tells us any system tends towards disorder.

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