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TIL from 1976 to 1989 an unknown taping noise was audible worldwide on commercial and civilian communications (tv broadcast, commercial aviation, SW radio). The source was the Duga radar "The Russian Woodpecker" a huge over-the-horizon radar used by the Soviets as a missile detection system.

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X0DJE TIL that the Shire breed of horse was first developed as the "Great Horse" during the reign of King Henry VIII of England. Acts were passed in 1535 and 1541 forbidding the use for breeding of horses under 15 hands (60" at the shoulder) in height, also prohibiting all exportation, even into Scotland.
6E4yl TIL that rolling stone gave Elton John's album 'Goodbye Yellow Brick Road' a scathing review, despite years later including it as #91 on their list of top 500 albums of all time
wLlp1 TIL Hanako is probably the most famous koi fish ever in history due to her astonishing age. When Hanako died in 1977 she was believed to be 226 years old, making Hanako the oldest koi fish ever in the world.
4KyN TIL that a hen turns her egg 50 times per each day to keep the yolk from sticking to the side
0wV9R TIL that in the mid-1970s, several years after having left The Monkees, musician Peter Tork worked as a high school teacher in Los Angeles, where he taught music, social studies, math, French, and history, and also coached baseball.