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TIL the gang known as MS-13 started when group of teenage heavy-metal lovers founded the Mara Salvatrucha Stoners. Their hand symbol originated from Black Sabbath singer Ronnie James Dio.

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P11xL TIL there's a gene that controls how long you sleep. "Short sleepers" function the same off of 4-6 hours of sleep as a typical individual getting 8.
ZpXrG TIL That 30 percent of humans see floaters, I see them when I stare at a wall and move my eyes
8G0a TIL through years of natural selection due to epidemics in Europe, a percentage of people of European decent carry the gene CCR5. Of that population, some have a CCR5-32 Delta mutation which makes them immune to HIV.
69veZ TIL that approximately 1 out of every 10 adults in the US are millionaires
woe17 TIL the land Central Park is on was formerly a majority-Black settlement named Seneca Village. The land was seized through eminent domain, razed, and the settlement was largely forgotten until the publication of "The Park and the People: A History of Central Park" in 1992.