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TIL A dog named Cactus ran an ultramarathon in the Sahara Desert just for fun, beating the majority of human runners.

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nWWBY TIL about Dick Bong: an American Flying Ace with 40 victories in the Pacific Theater of WWII.
OG7y7 TIL that in 1917, during World War I, the British Army tried to train seagulls to poop on German U-boat periscopes to obscure their view. They even tested it with fake periscopes on beaches, but the gulls were more interested in stealing sandwiches than sinking submarines.
16QRP TIL that Missouri is likely called the Show-Me State in reference to a speech from a Congressman in 1899: "I come from a state that raises corn and cotton and cockleburs and Democrats, and frothy eloquence neither convinces nor satisfies me. I am from Missouri. You have got to show me."
gMW9D Why aren’t stop signs yellow, purple or green? Brainstuff explains the origins of the red, octagonal stop sign and some hints about why red might be the best...
E1EAX TIL tears contain leucine enkephalin, a natural pain killer, which is suggested to be the mechanism behind the experience of crying from emotion making an individual feel better.