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TIL that the kings in regular playing cards refer to specific historical kings.

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1Qd4 TIL the only place Jews were allowed to emigrate from Germany with their money was Palestine thanks to the 1933 Transfer agreement between the German Zionist Federation and the German Economics Ministry.
9nbm TIL The Horseshoe Crab, which has been around for 450 million years, bleeds blue blood because it has Hemocyanin, which has copper, instead of hemoglobin as a transport protein.
NXZwN TIL about Oppianicus, a Roman man who killed or ordered killed several of his relatives for power. He also killed his youngest sons because his fifth wife didn't want to be a stepmom. He tried to kill his stepson, who then prosecuted against him, resulting in Oppianicus's exile.
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