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TIL there are microscopic living things in solid rock up to 7 km deep, called Endoliths. So little energy is available they undergo cell division once every 100 years, and some may only divide once every 10,000 years.

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mxypE TIL that there are many scientific names for water such as dihydrogen monoxide (subject of a famous hoax), oxidane, hydrohydroxic acid, hydric acid, hydrogen oxide, hydrol, and hydrogen hydroxide. Most of these names are not widely used, but are technically correct.
rRDWW TIL an attempt to fish deep sea "Twilight Zone" species (which number in the quadrillions) resulted in a fishery burning down because the Lanternfish spontaneously combust at surface temperatures.
ZpJ7Y TIL that "Disco Duck," a novelty disco song featuring a talking duck, hit #1 on the Billboard Hot 100 in 1976
Gaxg TIL in 2006 Ticketmaster President Sean Moriarty publically pleaded for legislation that would make the selling of concert tickets from person to person illegal except through Ticketmaster.
xnkg TIL Ancient Babylonians were so serious about brewing beer that if anyone brewed a bad batch they would drown him in it as a punishment