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TIL that Geladas are the last remaining species of ancient grazing pronates. They use their large teeth to intimidate and assert dominance.

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epWgJ TIL While Apollo 15 astronaut Jim Irwin was lugging heavy objects on the Moon, flight surgeons noticed an irregularity in his heart rate and realized he had bigeminy. His heart condition eventually killed him 20 years later.
5N19 TIL Charles Darwin’s cousin Francis Galton invented the dog whistle, meteorology, forensic fingerprinting and mathematical correlation. He also suggested that principles of animal breeding could be applied to humans, coined the word ‘eugenics’, and came up with the 'nature vs nurture’ idea.
9Y55r TIL the gerenuk or giraffe gazelle (Litocranius walleri) is a long-necked antelope found in arid areas of eastern Africa. Primarily a browser, gerenuks forage on leaves and fruits, sometimes even standing on their hind legs and elongating their necks to feed. Male gerenuks have lyre-shaped horns.
N7XxE TIL that in 1518 a group of people actually danced until they died. One of the only known cases of "dancing mania"
4kRlg TIL: 1) The Latin word for "ants" is "formica". 2) Formic acid is produced by ants. 3) Engineers invented a plastic laminate to replace mica as an electrical insulation and named it Formica ("for mica", get it? ). 4) Despite its name, Formica is not made with formic acid. Whew!