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TIL about Rumpology, a pseudoscientific method of learning about a person’s character and revealing their past and future by examining their buttocks. It is also sometimes referred to as asstrology

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lovL5 TIL that In October 1971, a physicist and an astronomer took 4 cesium-beam atomic clocks aboard commercial airliners. They flew twice around the world and when reunited, the sets of clocks were found to disagree according to the predictions of the relativity theory
eGVb TIL of the Ideological Turing Test to determine if someone understands his opponents arguments: a partisan writes an essay from the POV of his opposite. If a neutral observer cannot tell the difference between the partisan’s answers and the opposite’s answers, the partisan passes the test.
p8GwQ TIL how IPAs, or “Indian Pale Ales” got their name. Most beers couldn’t withstand the 6 month trip from Great Britain to the British colonies in India, where the climate was too hot to brew. In response, a brewer heavily hopped and aged their beers, making them pale, and able to survive the journey.
xVbXk TIL in Texas a jury can give the final sentence for murder instead of a judge. As a result, Texas has "misdemeanor murders" where a convicted murderer gets a light sentence like probation because the defense convinced the jury that the victim deserved it.
OGExY TIL: Trepanation is one of the oldest surgical procedures (if not the oldest) we have archaeological evidence for, dating back to 7,000–10,000 years ago.