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TIL the Catholic Church designated Beavers and Capybaras as fish, allowed to be eaten during Lent, due to their aquatic nature.

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nWNY9 TIL African elephants can exchange information by emitting low-frequency sounds that travel dozens of miles under the ground on the savanna. The sound waves come from the animals' huge vocal cords, and distant elephants “hear” the signals with their highly sensitive feet.
WlB4 TIL that during the 1912 Olympics, one of the Japanese athletes didn’t notify race officials during a marathon, and technically didn’t finish. He later completed it when notified of this in 1967, making his time at 54 y, 8 m, 6 d, 8:32:20.3.
ARL4 TIL of Maximilian Kolbe, a priest in Auschwitz who volunteered to die in the place of a stranger who cried out “My wife! My children!”. In the gas chamber, he kept all the others sentenced to death calm and was the last one to die.
WkLx9 TIL, CBC had a contest to complete the phrase "as Canadian as ____" (by analogy with "as American as apple pie"). The winner: "as Canadian as possible, under the circumstances"
VM9OB TIL: Wilbur & Orville Wright's father gifted them a toy helicopter (based on an invention of French aeronautical pioneer Alphonse Pénaud). They played with it until it broke, and then built their own. They later pointed to their experience with the toy as the spark of their interest in flying.