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TIL that for decades, radiotherapy patients had reported phenomena such as "flashes of bright or blue light" when receiving radiation for brain cancer. This was confirmed to be Cherenkov light being generated in the fluids of the eye by researchers in 2019.

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BkMe TIL a century ago women were very involved in the movie industry in key positions. Half of all the films copyrighted in between 1911 and 1925 were written by women and during the twenties a quarter of the screenwriters were women
dDMgZ TIL that humanity has a 95% probability of going extinct by the year 10,000 AD according to Brandon Carter's formulationof the controversial Doomsday argument, which argues that half of the humans who will ever have lived have probably already been born.
OoLEY TIL In August 2006, NASA announced that they had lost all of their original tapes of Apollo 11's TV transmission of the first humans landing on the moon
x6LnB TIL that there is an Episcopal saint, Rev. Charles Carroll Parsons, who was at one point the defense council to Lieutenant Colonel Custer who died at the Battle of Little Big Horn.
XEVaD TIL that karats measure the parts per 24 so 24 karat gold is considered 100% gold.