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TIL if a person has had part of their body crushed in an accident and trapped for more than 15 minutes, you should NOT free them without medical personnel on the scene. Crushed muscles break down into toxic byproducts, and releasing the pressure lets these flow into the body, killing the person.

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GYgnQ TIL that the 1904 Olympic marathon involved a runner who drove 11 miles to the finish line, a runner who was poisoned by his coaches, a runner who was chased by dogs for one mile, and a runner who ate a rotten apple, took a nap and still finished fourth.
0Yyy TIL that in the Articles of Confederation, Canada was invited to join the United States should it seek independence. This applied only to Canada unless nine states said otherwise.
78D0X TIL The question asked by The Beatles in "Eleanor Rigby" (1966) -- "All the lonely people, where do they all come from? / All the lonely people, where do they all belong?" -- inspired the band America to write an encouraging, uplifting response with the song "Lonely People" (1974).
EnwV TIL that astronomers recently discovered an unfathomably large structure just beyond the edge of the known universe that is pulling galaxies towards it at breakneck speeds. Some think it could be another universe butting up against ours.
XEyKD TIL The origins of the cowboy tradition come from Spain, beginning with the hacienda system of medieval Spain. This style of cattle ranching spread throughout much of the Iberian peninsula, and later was imported to the Americas.