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TIL, the round symbol with black corners coming from the center of it that are used as fiducial markers in crash test dummies and crash test cars is called the Secchi disk. It was invented in 1865 in an era when automobiles weren't an everyday driving vehicle for the masses.

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ADBla TIL evidence of Homo erectus having lived on remote islands 150 miles of the coast of Africa suggests they were capable of crossing long distances over the sea, between 500,000 and a million years ago, which implies that they built boats.
eppjL TIL Fiat is an acronym for "Fabbrica Italiana Automobilli Torino"
GAVgJ TIL that King George IV attempted to divorce his wife by Act of Parliament - neither he nor Queen Caroline would admit to adultery, so the bill would declare Caroline guilty
QNKXd TIL that in Japan there is a group of prominent female housewife stock traders known as Mrs. Watanabe who are so proficient at what they do that many traders look to them for reference on which stocks are doing well.
4XoyR TIL Japanese Doctor Fukushi Masaichi (1878-1956) was the worlds leading collector of body torn tattoos. He would offer prisoners money to be able to remove their skin after death. He had an immense collection.