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Posted Saturday, July 2nd, 2016 at 3:34 pm by in .Edit this post More in

I’ve been cut off best place to order levitra online An atomic clock’s stability can be thought of as how precisely the duration of each tick matches every other tick, the NIST said in a statement. Typical atomic clocks use atoms of cesium or rubidium to maintain accuracy. The atomic clock used for official time-keeping in the US, NIST F-1, is a cesium-based clock.

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