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TIL The First Lady of the United States, Lou Henry Hoover, became the first woman to receive a degree in geology from Stanford University.

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awa5y TIL That several people have turned themselves blue by drinking colloidal silver for "health"
5YQ5Q TIL of US president Grover Cleveland's wife. She was the youngest first lady, the first to be married in the White House, and the first to give birth while her husband was president. Grover met her shortly after she was born, when he was 27.
oBdXW TIL 6 geologists were convicted of manslaughter in Italy, 2009, for failing to predict an earthquake
OoDx7 TIL about the surviving 2nd century Roman novel A True Story written by Lucian of Samosata. It is regarded as one of the first ever works of science fiction ever written and it features explorers flying to the moon, first contact with aliens, an interstellar war and the discovery of a new continent.
xVMlo TIL of Hilberts Hotel. It can accomodate any number of new arrivals, even when it is already fully occupied. Surprisingly, it can even accomodate an infinite number of new arrivals, when already full. In both cases however, all guests must move to a different room.