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TIL: The expression ‘mad as a hatter’ is based from the real-life behavior of hatters from the 17th century. It wasn’t until 1941 that hatters discovered that the mercury they used to make hats was poisoning them and making them insane.

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N7koN TIL there’s even a crater on the moon named after a Confederate officer.
woXo TIL the slang term for prostitute is believed to have originated from Civil War General Joseph Hooker because he was a hardcore partier with many ladies.
ADJXx TIL a Danish company modified a version of thale cress (plant), that changes from green to red when being near landmines, because of the nitrogen dioxide gas released from landmines. This way you can detect landmines and save lives.
D1gXr TIL: Chris Farley was Originally The Voice of Shrek and had recorded 85% of his lines before he passed away.
x6av0 TIL that the chocolate makers J.S. Fry & Sons had a famous advert featuring a crying boy who becomes happy after having chocolate. The boy was actually forced to cry after having an ammonia soaked cloth wrapped around his neck by his dad, who then took a photograph of this used in the advert.