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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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xyBg TIL the side swipe damage of the iceberg that collided with the Titanic was a freak accident that has never occurred before or since in maritime history. If the Titanic had not attempted to go around the iceberg, crashing into it instead head on, it would have survived the impact and stayed afloat.
6Er7W TIL: In Japan a 63 year old fisherman and karate expert fought off a bear, then drove himself to the hospital
4XMkN TIL the THX sound from the opening credits of movies has a name
Oo95R TIL that the NFL theme song by Scott Schreer is actually a combination of two of the tracks he made in two days with the inspiration "Batman on steroids"
wdlY TIL that one day in 1880, three men from Arkansas, searching for a wildcat, stumbled on a mysterious cave whose inside was covered in a radiant blue color. The three men immediately fell ill and were covered in sores after leaving the cave. They had discovered the first radium mine in America.