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TIL that a Blink Comparator is a mechanical device for visually comparing two similar images. In 1930, it was instrumental in the discovery of Pluto.

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KO5Ga TIL That archaeologists in China found a surprising haul in one tomb, where they uncovered a bronze cooking pot. When they opened the pot, they found 2,400-year-old bone soup. Because of oxidization, the soup turned green, but it was still in liquid form, and the bones were still floating on top.
ewxL TIL that Jackie Chan is a staunch supporter of China’s communist party, thinks Taiwanese democracy is “the biggest joke in the world,” and believes Chinese citizens need to be “controlled” through censorship, “otherwise they’ll do whatever they want.”
mxRdx TIL that a newly hatched Echidna is so tiny and underdeveloped that you can actually see the milk in its stomach because its skin is nearly transparent.
R71o6 TIL Jupiter, Uranus and Neptune all have ring systems
QJbKp TIL the first "Seven Wonders" lists came guidebooks popular with Hellenic sightseers that date from the 2nd-1st century BC.