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TIL of a substance called “Libyan Desert Glass”; found in the Eastern Sahara and the deserts of Libya, this glass is of unknown origin (possibly from meteoric impacts), and has been found in ancient Egyptian Jewelry such as Tutankhamun’s Pectoral.

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rmKy TIL the existence of MI6, the agency with which James Bond works, wasn’t officially acknowledged by the British government until 1994
ZpmyG TIL Neil Armstrong and Nobel physicist Richard Feynman led the investigation of the Space Shuttle Challenger disaster. Feynman was annoyed at being called by NASA and fighting cancer but his wife urged him to join the commission
p8X9b TIL - Shortly after the Nazi invasion of Yugoslavia, the Nazis had set up an area with captured Yugoslav aircraft. But while the German guards were listening to the news, local communists moved the fence separating the working ones from the non-working ones, leading to all aircraft being scrapped.
WkEZN TIL in 2017, three infertile mice were able to give birth to healthy offspring after being implanted with artificial 3-D printed ovaries.
BrPrK TIL Composer Franz Liszt's hotness is a matter of historical record. Such was his beauty, talent and benevolence, the Hungarian pianist was said to bring about states of 'mystical ecstasy' and 'asphyxiating hysteria' in his fans. Many doctors felt he posed a public health risk.