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TIL there is a species of bird that has only been found once. A Red Sea Cliff Swallow was found in Sudan in 1984, and a second bird of this species has never been found. There is not enough conclusive evidence to say it matches any other species of swallow, so it is still listed as its own species.

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wJgY TIL that the white spots on finger nails are called Leukonychia, and are harmless and most commonly caused by minor injuries that occur while the nail is growing. Contrary to popular belief, leukonychia is not a sign of excess or deficiency of calcium and zinc or other vitamins in the diet
Bg6pr TIL that there is a single group of indigenous people, the Yupik, who lived in both the Americas and Eurasia (Russia) prior to European discovery of the new world.
ldWB TIL that nearly all Japaneses school staff are trained to use a weapon called the Sasumata. It is a two pronged people catcher based off a medieval weapon of war that is used to immobilize intruders.
4X1V6 TIL A baby puffin is called a "puffling."
W7wjA TIL of Sir William Payne-Gallwey, a British MP who died after falling on a turnip.