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TIL before 1975, the BBC overwrote or destroyed old show tapes. Hundreds of Doctor Who episodes were thought lost forever, until a worldwide hunt began to turn them up—e.g. 2 in a London Mormon Church, and a goldmine 9 in Nigeria (employees had ignored instructions to burn them). 97 remain unfound.

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GY14E TIL about saturation diving. Divers working on deep-sea infrastructure such as oil pipelines live in a pressurised chamber for a month, taken between the chamber and their worksite by a pressurised diving bell. That way, they only need to be decompressed once, at the end of each 28-day job.
eg1E TIL that Muhammad Ali was invited to North Korea in 1995 with a collection of other athletes. Though he didn’t speak much during the visit, at one function, as officials claimed they could take out the US or Japan whenever they wanted to, Ali declared loudly “no wonder we hate these motherfuckers.”
v1xyx TIL Jason Mraz once was a pickle boy at the Minnesota Renaissance Festival, where he would offer to trade you his dill for a bill.
Qvw6 TIL that Clair Patterson, the geochemist who discovered the Earth’s age to be 4.5 billion years old using lead isotopic data from the Canyon Diablo meteorite, also spearheaded the campaigning of the US government to finally ban of the use of lead in gasoline, paint and food packaging.
4ROw TIL in 1680, the Pueblo Indians of N.M., unified by leader Popé, drove off their Spanish oppressors for 12 years. Because of this, they were able to save their culture and beliefs, which still exist today. The Pueblo Revolt is considered the most successful Indian rebellion in American history.