| Who's calling? http://www.pms.pt/write-my-persuasive-paper/ tutoring programs 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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