GPS, relativity, and nuclear detection

GPS is just a big clock in space! (and it can detect nuclear explosions) Trying out a new feature: English Transcript! Let me know how it works Tweet it - http://bit.ly/ufPyF7 Facebook it - http://on.fb.me/vBkxlV minutephysics is now on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And

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