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TIL that Promethium is an extremely rare metal, with only about 500–600 grams naturally occurring in the earth’s crust

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xjgw TIL That Herbert Hoover and his wife learned Mandarin when living in China during the Boxer Rebellion, and would speak it in the White House to foil eavesdroppers.
QJBdX TIL that the shape of the human penis has evolved to remove another man's semen from a women's vagina
Z8jWa TIL the US Army Ordnance Department sabotaged the prototype AR-15 with 3 critical changes when it went into mass production as the M16, leading to its poor performance in the Vietnam War.
Zl8v TIL “Brasil” not only refers to a country, but also a mythical island west of Ireland said to be cloaked in mist for all but one day every seven years.
oBevK TIL - A dog was called to the witness stand in the 1922 Court Case of Helmick v. Morse - who were fighting over custody of the dog (Buddy). The dog saw Mrs. Helmick, ran straight towards her and wagged his tail excitedly. The Judge immediately handed the dog over to Mrs. Helmicks.