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TIL Techniques in astronomy of taking images of the sky are being used by dermatologists to monitor melanoma in high-risk patient who have their full body photographed. A patient’s skin is treated like the background sky in an astronomical image, and any moles are treated as stars

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vAgx TIL: In her 85 years of life, Napoleon Bonaparte’s mother (1750-1836) lived long enough to see the collapse of the French monarchy, the French Revolution, the crowning of her son as Emperor, his death, the collapse of his empire, and the restoration of the monarchy.
bVmN TIL of UVB-76, a mysterious Russian radio signal that has been transmitting continuously since 1982. Nobody knows who makes the signal, only that it is located near Moscow, makes a buzzing sound 25 times a minute, and every few years will broadcast a string of random names and numbers.
jQPQ TIL that the South Park team begins episode production only a week before the air date, including script writing. Sometimes they even send the episode over just a few hours before it airs.
1B64 TIL A yellow ribbon on a dog signifies it may be a threat, and that you must proceed with caution around it
4Lk6 TIL gay swans will form temporary threesomes with females to obtain an egg, before driving her away.