An adventure in relative time-keeping

An adventure in relative time-keeping
http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_60/iss_3/16_1.shtml

Time Too Good to Be True
http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_59/iss_3/10_1.shtml

I enjoyed Daniel Kleppner's Reference Frame about the relativistic
effects of elevation on precise clocks (PHYSICS TODAY, March 2006,
page 10). He would be amused with an experiment I did with my kids
last year.

The year 2005 was the widely publicized 100th anniversary of
Einstein's first paper on relativity and the lesser-known 50th
anniversary of Louis Essen's first cesium clock. To celebrate, I
created Project GREAT (General Relativity Einstein/Essen Anniversary
Test), perhaps the first "kitchen science" relativity experiment.

See: http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_60/iss_3/16_1.shtml
.