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Metrology

Once, humans told time by looking at the heavens. But since 1967, metrologists have defined time instead by measuring atomic activity — clocking, as it were, the eternal heartbeat of the universe.

THE BROAD VIEW

Get ready for the new, improved second

Scientists are preparing to redefine the fundamental unit of time. It won’t get any longer or shorter, but it will be more precise — and a whole lot more powerful.

2022-04-29T21:50:00.000Z

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