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TIL in 1924, the US had "Radio Silence Day" where radio broadcasts would be kept quiet for 5 minutes every hour in order to listen for radio signals from space. They didn't hear anything.

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awno TIL That a Scientists once carved some meat out of 36,000-year-old baby bison and made a stew, The stew was not only edible, but deemed “acceptable.”
P17Dn TIL that the planet's average temperature compared to today was just 6°C (11°F) lower, during the last ice age, and 4°C (7°F) higher, during the age of the dinosaurs. "In climate terms, a change of just a few degrees is a big deal." (Bill Gates, 2021)
R7XAa TIL that when Nichelle Nichols read for the part of a communications officer in 'Star Trek', she had a copy of Robert Ruark's 'Uhuru' with her. 'Uhuru' is Swahili for 'freedom', and when Gene Roddenberry heard what the word meant, he changed the character's name to 'Uhura'.
Br4Ld TIL that there are several species of Flies that have the common name 'coffin fly', because they breed in human corpses with such tenacity, they can even continue living within buried coffins.
XEGrD TIL of the Killers of Eden, a group of Killer Whales, known for their cooperation with humans between 1840 - 1930 who would assist whalers in hunting baleen whales.