In September 2005 (for the 50th anniversary of the atomic clock and 100th anniversary of the theory of relativity) we took several cesium clocks on a road trip to Mt Rainier; a family science experiment unlike anything you've seen before.
By keeping the clocks at altitude for a weekend we were able to detect and measure the effects of relativistic time dilation compared to atomic clocks we left at home. The amazing thing is that the experiment worked! The predicted and measured effect was just over 20 nanoseconds.
The main Project GREAT page has technical details.
click the title of this blog to see the great pics on his website.
IMHO i think that what this guy did is really great. and the family is great too for indulging such nerdy behavior. ;)
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