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TIL that in the 1960's, a Donald Duck cartoon was deemed 'prior art' and used to deny a patent for using foam balls to raise a ship from the water.

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jyyv TIL that a possible origin of acupuncture is based on Chinese doctors observations that soldiers wounded by arrows were cured of chronic afflictions
nereo TIL: "Tired and emotional" is a British euphemism for alcohol intoxication (or drunkenness).
D1eLe TIL Jeff Bezos funded a team that searched the Atlantic Ocean for discarded NASA rockets. By 2013, the team salvaged two rockets. After careful inspection, the team realized they found part of the rockets used to carry Neil Armstrong, Buzz Aldrin, and Michael Collins to the moon on Apollo 11.
6QBm TIL Major League Baseball umpires are required by rule to wear black underwear, in case they split their pants.
0dNp1 TIL of "sun outages" in days near the equinoxes, in which signals to or from geosynchronous communication satellites are drowned out by the radio noise blasting from the sun as the satellite or the earth from the satellite's POV moves slowly near it.