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The first atomic clock was invented in 1948 by the US Bureau of Standards.

The first practical atomic clock was invented by English physicist Louis Essen in the 1955.

Atomic clocks use the energy changes that take place in atoms to keep track of time. Atomic clocks are so accurate that they lose or gain no more than 1 second once every 2 or 3 million years.

The most accurate, modern-day atomic clocks will neither lose nor gain a second in 168 million years.

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13y ago

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