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TIL: Amniotic fluid dries into a fern pattern on a slide on its own without anything added to it

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e0d1n TIL in 1744, two Scottish Presbyterian ministers made a plan to have fellow ministers pay a small amount a year into a fund, which would be used to take care of their widows if ministers died. It became the blueprint for modern insurance, and their fund, Scottish Widows, is now worth billions.
kr0e TIL There is a pistol that fires the same round used in the Barrett .50Cal BMG Sniper Rifle used by special forces snipers, and it looks like something from Star Wars! (video in comments)
xVn11 TIL In 1944 the goaltending rule was adopted in basketball making it illegal for a defensive player to touch the ball on its downward flight. This was in reaction to Bob Kurland & George Mikan standing in front of the basket and swatting practically every opponent shot attempt.
Z8rpD TIL about the RED T, a nonprofit organization advocating for the protection of translators and interpreters in high-risk settings.
Zpll4 TIL: The 34 yr-long Lenski Experiment has studied over 75,000 generations of E.coli since 1988 to understand evolution.