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TIL in 1994, a paper was published in a medical journal presenting a method to calculate the area under a curve, using rectangles and triangles, called "Tai's model". The researcher was unaware this method has been known for 2400 years and exact methods using calculus for 400 years

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gNO7 TIL that voluntarily curling your toes causes your asshole to contract
BgVWr TIL the man who discovered the LED died of starvation.
VBKkD TIL at a minimum an estimated 11% of Adults aged 15 to 49 in South Africa have HIV/AIDS, with a high estimation of 23%.. approx. one in ten, to one in five people; respectively.
LkPNv TIL that there is a music genre dedicated to the 80´s called Retrowave (or Synthwave) which emulated the era on spot, only with modern production.
DrZY TIL Voyager 1, the only man made object to leave the solar system, is carrying, amongst other records, a song called “Dark Was The Night, Cold Was The Ground”. This song is available to extraterrestrials, should they ever find it, but not available in India, Canada, or the UK on copyright grounds.