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TIL that snow and ice are only slippery because of a 4 molecule thick layer of water that is always present at the surface down to as cold as -30C; below -30C it becomes a true solid and skating and skiing are extremely difficult

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wOdJ TIL using fountain pens in a school in Edinburgh improved academic performance and self esteem
8e1WZ TIL Christy Martin, "The Coal Miner's Daughter," was a pioneering figure in women's boxing. She won multiple titles, including the WBC women's super welterweight championship, during the 1990s. Martin was inducted into the Boxing Hall of Fame in 2020.
yQXpw TIL about the Crypt of Civilisation time capsule at Oglethorpe in Atlanta, the oldest millennial time capsule conceived in 1936 that is set to be opened in 8113
DEAY TIL that Indian spacecraft Mangalyaan’s journey from Earth to Mars took 6 months, which is less than Christopher Columbus’ first journey from Europe to America (8 months)
M7Xj8 TIL that, in June 1947, Kenneth Arnold became the first person to describe seeing a “Flying Saucer”, popularizing the common image of alien spaceships