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Particle physicist Professor Brian Cox asks, 'What time is it?' It's a simple question and it sounds like it has a simple answer. But do we really know what it is that we're asking? Brian visits the ancient Mayan pyramids in Mexico where the Maya built temples to time.... Science http://topdocumentaryfilms.com/do-you-know-what-time-it-is/ http://topdocumentaryfilms.com/do-you-know-what-time-it-is/ 170517