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TIL Human fingers can feel objects as small as 13 nanometers. “This means that, if your finger was the size of the Earth, you could feel the difference between houses from cars.”

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via reddit.com

womD7 TIL about the "Rabbit Test," a human pregnancy test developed in 1931, in which urine from a female human would be injected into a female rabbit. The rabbit would be dissected and if its ovaries were enlarged then the human was likely pregnant (~98% certainty). The test was used into the 1970s.
WkaXL TIL the Bloodbath of B-R5RB, the largest PvP battle of all time, has its own Wiki page tracking commanders, casualties, a detailed timeline, and shifts to the political ingame landscape. The battle was also commemorated by an ingame monument.
pZwb TIL during the Viking age many Scandanavians wore mini Thor hammers around their necks
kO5QB TIL Aztlán is the ancestral home of the Aztec peoples. Nahuatl legends relate that seven tribes lived in Chicomoztoc, or "the place of the seven caves". Each cave represented a different Nahua group, each of the seven groups is credited with founding a different major city-state in Central Mexico.
0GA5 TIL: The “chestbuster” scene in Alien was inspired by the feeling/pain that it’s writer, Dan O'Bannon, experienced when battling Crohn’s Disease.