The U.S. workweek hasn't always been 40 hours long, so maybe something else is possible. Gearstd/iStock via Getty Images Plus About 1 in 3 Americans make at least one New Year’s resolution, according ...
In 2008, a team of UCLA-led scientists proposed a scheme to use a laser to excite the nucleus of thorium atoms to realize extremely accurate, portable clocks. Last year, they realized this ...
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