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TIL that if the SR-71 was attacked by surface-to-air missiles, it simply flew higher, faster, and in a slightly different direction to outrun them.

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jNMGQ TIL in 1981 members of a U.S. nuclear semiotics team believed if the world ended, survivors 10,000 years in the future might not know what the radiation symbol means. So they proposed breeding bioluminescent cats that would glow when they came near radiation to serve as living indicators of danger.
1akV7 TIL that in 1859, a guy released 24 rabbits for hunting into the wild in Australia, a country which had no native rabbit population then. By 1920, their population increased to 10 billion. This is the fastest spread ever recorded of any mammal.
Bggar TIL 100% of global Aspirin production comes from a tiny town of 3000 inhabitants named Lada, in Langreo, Asturias, Spain.
lEmA TIL Congress added the “Under God” phrase to the Pledge of Allegiance during the Cold War. This symbolized the resistance to communists, who were atheists.
epK6E TIL the word 'genericisation', when a brand name and the product have become so common and popular that it instead comes to represent the entire product category. E.g. Hoover, Bacardi, Tannoy