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TIL passing high frequency sound waves through a liquid results in the formation of imploding microscopic bubbles that can be used to clean the inside of submerged objects in a process known as an ultrasonic bath

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P1m1n TIL in 2011 Alex Trebek - the long-time host of Jeopardy! - was woken by a burglar in his hotel room. He proceeded to chase the robber though the hallways in his underwear before tearing his Achilles. The thief was later apprehended.
Egxv7 TIL that cousin marriage is more like "a norm" than a "taboo/exception" and only half of the US states ban it.
4e15 TIL that the tallest building in Korea is not in super-booming South Korea, but in North Korea. The RyuGyong Hotel.
M7VEB TIL that 'Magikkun', which means “mask fraud”, is a word that South Koreans use to describe people who hide their facial features by wearing masks on dating apps.
8eQQb TIL that W.W. Denslow the illustrator of the original Wonderful Wizard of Oz (1900), died after a drinking binge.