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TIL mandrills are the world's largest monkeys and they are found in Cameroon, Gabon, Equatorial Guinea, and Congo. The red and blue pigments, which are highly favored by females, derive from light diffraction in facial collagen fibers. Every night, each mandrill group sleeps in a different tree.

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8aGZa TIL "2001: A Space Odyssey" was initially very poorly received by audiences due to it's slow place and ambiguous plot. The movie became more successful when masses of people began flocking to watch the movie while stoned, with MGM even advertising it as "The ultimate trip".
8ea84 TIL that in addition to Little Boy and Fat Man the Manhattan project also worked on a design called "Thin Man". The project was shelved after it was found that plutonium isotope impurities would have likely caused it to blow itself apart prematurely.
7rrBX TIL that the original author of Thomas the Tank Engine (The Railway Series) has created an extensive Island of Sodor book with the complete lore of Sodor, from the history of the railway to the island itself. The book is rare, and goes for $500 or more.
dDrL8 TIL there are 42,634 high schools in the United States. In 2023 the Ivy League Colleges are expected to enroll 14,308 students. If every Valedictorian applied to an Ivy League school, and only Valedictorians were accepted, less than 34% would get a spot.
vB6r TIL Evelyn McHale is referred to as the “Most Beautiful Suicide”. On April 30, 1947 she jumped from the observation deck of the Empire State building and fell 86 floors onto the United Nations Assembly Cadillac. The picture was taken by a photography student 4 minutes after the crash.