A group of physicists has stared at 12 atomic clocks located in the United Kingdom, France, the United States, Germany, and Italy from 1999 to 2014. Eight of these clocks are one of the most precise ...
The NIST result, made possible by continual improvements in the world's most accurate atomic clocks, yields a record-low, exceedingly small value for a quantity that Einstein predicted to be zero. As ...
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