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TIL during the invasion of the Soviet Union in 1941, the German 4th Panzer Division cut off 10,000 Soviet troops. They took 2,000 prisoners... and just let the others go. They simply couldn't afford to take them all prisoner.

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1ybP TIL: A world-wide Gallup poll named the USA the #1 threat to world peace.
4kRyJ TIL the screw thread is believed to have been invented around 400 BCE, by Archytas of Tarentum, a Greek philosopher sometimes called “the father of mechanics.” The general principle of the screw was applied early on, in cities like Pompeii, to extract olive oil and grape juice
kJwnd TIL that the moon moves about 3.8 cm farther away from Earth every year, which means that one day there will be no more total solar eclipses.
JY9OV TIL that Chinese Paddlefish, one of the largest freshwater fishes, found mainly in the Yangtze river in China has been declared extinct in the wild after surviving 150 million years on this planet due to overfishing and construction of the Gezhouba Dam.
OG4Ve TIL that english scientist Henry Cavendish discovered physical laws like Ohm's, Dalton's, or Charles's law and few others as first but they were not named after him because he didn't publish his notes and didn't tell his fellow scientists, propably due to being asocial and shy