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TIL during the Apollo 16 lunar mission in 1972, the crew brought a lunar rock first collected by Apollo 12 in 1969 BACK to the moon as part of a magnetic field experiment. The rock ended up travelling back and forth between moon and Earth twice.

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GYo55 TIL in 2005, the Vietnam War ballad "Fortunate Son" was used in a commercial for Wrangler Jeans, while the drug culture anthem "Lust For Life" was used by Royal Caribbean to promote their cruises.
R700w TIL that the wood of Lignum Vitae is so hard and dense that the bearings of the drive shaft for the the nuclear powered USS Nautilus are made from it.
kg7E TIL in the ‘60s and '70s, professional bowlers were international celebrities who made twice as much money as NFL stars
VMXQG TIL in the 1980s Quentin Tarantino worked as a recruiter for the aerospace industry
kmGE TIL that contrary to popular belief, almost all surgery during the American Civil War was performed under general anesthesia and “pain bullets” are a myth. They were actually chewed by pigs.