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TIL a gravitational slingshot (of say a space probe) robs the host planet of a very small amount of orbital velocity. Do it enough times and you’d cause said planet to crash into the Sun.

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4XK8g TIL Mount Everest is only the world's tallest mountain as measured from sea level. But since the earth bulges at the equator, the mountain Chimborazo in Ecuador is the tallest mountain if you measure from the earth's core.
gMNWL TIL that when Spanish King Ferdinand II (funder of Columbus) went to war with the French over Naples, despite previously signing an agreement to partition the region, he said: "The King of France complains that I have twice deceived him. He lies, the fool; I have deceived him ten times and more."
j6wVM TIL that Christopher Lloyd played Uncle Fester in the Addams Family in 1991 and 1993
P1bkV TIL Billionaire Richard Branson started more than 100 businesses in total and failed at least 15 times
WZ0A TIL the term ‘second’ is in reference to the second division of 60 of an hour. The first 1/60th are called minutes and the second 1/60th are called seconds, hence the name 'seconds’.