Tick, tock, tick, tock. (From 2018)
, you can never be completely sure. “Everything we measure is approximate,” he says. “If you’re measuring distance with a ruler, you can only measure up to the accuracy of the ruler.”
Patla’s lab chose to study this obscure-sounding phenomenon because they could observe it in the clock with high precision. The clocks stay in a temperature and humidity-controlled room, and its atoms are kept in a vacuum-sealed chamber. NIST employees take rotating shifts to coddle the clocks properly. “If the temperature changes more than 0.5 degrees, they’ll get alarms to go fix it,” says Patla. “Most of it is automated, but someone watches it all the time, and someone carries a beeper.
Will isn’t surprised at their result. If they’d found the magnetic interaction changed from day to day, it would have upended current physics theory. “But it’s worth pushing the limits, just in case you find something,” he says.
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