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TIL "Hoisted by your own petard" refers to someone being blown up whole trying to plant an iron bell-shaped bomb used to dedtroy gates in the 16th and 17th centuries. I always assumed a petard was a kind of coat...

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OGn91 TIL Australia has a 1-kilogram $10,000 gold coin that is legal tender; however, its current gold value is about 8.5 times its face value.
90Y7 TIL a white woman married an African slave in 1681 Maryland, even though this bound her to serve her husband’s master, and their children would be born into slavery. Their descendants, all slaves, challenged the law, but only her great-great-granddaughter won freedom 100 years later.
DQ40r TIL shaving a long haired dog can make it susceptible to heat stroke
aRvJ TIL that the song “Barbie girl” by Aqua sparked a 5 year law suit between Mattel and the recording studio MCA Records, which the judge concluded with saying: “The parties are advised to chill.”
MW9A TIL that indentured servants were so called because their contracts were cut in two along a jagged edge so both parties could prove authenticity later by fitting them together, and the cuts looked like they were bitten by teeth