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TIL the word “slave” is derived from “Slav” since many Slavs were commonly enslaved in the early Middle Ages

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5VJDD TIL that there is a monument in Georgia that gives instructions in 8 languages on how to rebuild society after an unknown apocalyptic event, and it also functions as a compass, calendar, and clock.
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9Ywvr How is it that we didn't know why the ocean was salty until 1979? National Geographic Explorer-in-Residence Bob Ballard explains why such a basic question remained a mystery for so long—and where his team finally found the answer.
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5GAR TIL that map makers fabricate streets and geographical landmarks, called “Trap Streets,” to catch copyright violators.