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TIL a gentleman in the 1940s observed that the burr seeds that stuck to his clothes and his dog’s fur had a tiny hook structure. On closer inspection, he discovered the hooks were more reliable than a zipper. He developed a company popularly known today as Velcro.

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1pJO TIL there is a site on Earth that had naturally occurring nuclear fission reactions.
WkXZY TIL The Australian English for a duvet/comforter, "Doona", is an eponym for the Kimptons trademark "doona" product popular in the 70s.
kJ6PW TIL of Harry Hopkins, FDR's closest confidant and right-hand man in World War II. In 1939, he suffered from stomach cancer and lost 75% of his stomach in an operation. Told that he had only four weeks to live, Hopkins suffered through poor health to work throughout World War II, and died in 1946.
e804 TIL plastic-wrapped American cheese slices aren’t slices at all and are actually put on the plastic as a warm blob that’s flattened into a slice shape as it cools.
xVNwb TIL For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 20,000 year cycle. The area is next expected to become green in about 15,000 years, in 17,000 AD.