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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Scoop.it!
It's obvious that time has a direction: you were younger a decade ago than you are today. But according to the laws of physics, there is no intrinsic difference between the past and the future. In our latest One-Minute Physics animation, guest narrator Sean Carroll, a physicist at the California Institute of Technology in Pasadena, explains why a better understanding of the big bang will help explain the arrow of time. 
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