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TIL of Positronium, a nearly massless element made out of a meta-stable mix of matter and antimatter with no protons or neutrons. It can even form chemical compounds such as Positronium Hydride. When it does collapse, it releases pure energy as flash of gamma radiation, leaving nothing behind.

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69ol8 TIL about the Uncensored Library in Minecraft, created by Reporters Without Borders to combat censorship. This virtual library gives users access to banned or censored articles and information from around the world, featuring works from journalists who have been censored in their home countries.
epm0E TIL the UK is the only country to have successfully developed and then abandoned the capability to launch satellites into space. The Black Arrow rocket launched the Prospero satellite into orbit from Australia in Oct 1971. The project was cancelled that same year due to cost.
lo6JN TIL Wilma Rudolph had polio as an infant and was unable to walk properly until she was 11. For several years, her family had to massage her legs four times a day, and she had to wear a metal brace. In 1960, she became the first American woman to win three gold medals in an Olympic event.
KXpR TIL A Bond girl (from “For Your Eyes Only”) Caroline Cossey was born a man, Barry Cossey.
QJjmX TIL the NYPD once used a photo of three-time Oscar nominee Woody Harrelson to find and arrest a beer thief who looked like the actor.