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TIL 98% of Antarctica is covered by ice that is 1 mile thick

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R54J6 TIL Barbara Morgan, backup to Christa McAuliffe who died on the ill-fated Challenger mission, was also in a NASA chase plane that was following the Columbia when it broke up seventeen years later. She flew into space on Endeavour in 2007, fulfilling the Teacher in Space mission.
nevl7 TIL Sleep literally cleans your brain. During slumber, more cerebrospinal fluid flushes through the brain to wash away harmful proteins and toxins that build up during the day.
e7Yn Til that the Human population dropped to as low as 40 breeding adult couples
JYrBQ TIL about Niihau, Hawaii's 'Forbidden Island'. It is closed to outsiders. Seen from Kauai's western shore, Niihau appears almost ethereal on the horizon. The island is privately owned, a haven for Niihau natives, who can have no contact with tourists, and a site for US military testing.
QNGE9 TIL of Propaganda Due, an Italian masonic lodge founded in 1877 that by 1980s became known as the “a state within a state” responsible for high-level corruption and political manipulation.