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AUG 22, 2013 - Popular Science

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The World's Most Precise Clocks: 100 Times More Precise Than Cesium Atomic Clocks

NIST Boulder's Ytterbium Atomic Clock Burrus/NIST And they're about 10 billion times more precise than your quartz wristwatch. At the foot of the mountains abutting Boulder, Colorado, in the labs of the National Institute of Science and Technology, there sits the most precise clock in the world. It's so precise that, because it outstrips other atomic clocks, its creators weren't able to measure its precision until recently, when they built a second version of it. Now, with the two available to compare with one another, they've come up with a number for the clocks' precision, which ... Read More

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