Fun fact: The Earth's rotation is gradually slowing down. Each year, it loses 14 microseconds (A day becomes 14 microseconds longer each year).
In a hundred million years, a day will be almost four hours longer than it is today.
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I swear to god I've been feeling that slowdown every day since late 2016.
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That strange grinding of gears noise (circa 2016) explained. Thought it might soon be fixed. But it hit again yesterday.