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TIL that the white mustache-looking skin above a pigeon's beak is called a wattle, and that it mainly serves to release excess heat from the bird's body. It's actually a trait that many birds have, such as the red piece of skin below a rooster's neck.

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EgdB0 TIL In 1917, the world’s first animated feature film was made in Argentina. It was a political satire called El Apostol made up of 58,000 drawings and had a running time of 70 minutes. The film was lost after a fire destroyed the producer’s studio in 1926.
6lRW TIL that 5 scientists observed 60,000 episodes combined of 73 cows lying down to determine that: (1) the longer the cow has been lying down, the more likely the cow will soon stand up, and (2) once the cow stands up you cannot easily predict how soon that cow will lie down again.
9YaB7 TIL: China’s ongoing toilet revolution aims to replace open-pit latrines with safe, sanitary toilets and septic systems, to reduce the spread of parasites and diseases, and improve waste treatment.
Z8Nnv TIL the Agongointo-Zoungoudo Underground Town in Benin was rediscovered in 1998 when an unsuspecting bulldozer toppled into one of the caverns. Dating back to the early 17th century reign of King Dakodonou, the town consists of over 17 acres of underground homes built to shelter warriors.
QWLa TIL There is a sect of Jewish Monks in Ethiopia who proclaim to be the keepers of the Ark of the Covenant. Once inducted into the sect these priest are never allowed to venture outside of the temple.