. The most accurate type of time piece in the world, designed to measure time according to vibrations within atoms.
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Maybe it's a pendulum or a type of pendulum
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An atomic clock is the most accurate type of timepiece in the world, designed to measure time according to vibrations within atoms. NIST-F1, the United States' standard atomic clock, is said to be so accurate that it would neither gain nor lose a second in over 30 million years.
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