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TIL Mars' Olympus Mons, the tallest known volcano in the solar system, has such a gradual slope, someone standing at the base would not be able to see the summit because it's beyond the horizon.

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wL6gJ TIL that South America was once inhabited by giant sloths (Megatherium). It weighed up to 4 tonnes (similar to a present day elephant) and on its hind legs it would have stood 3.5m (12ft), which make it the largest bipedal mammal of all time. It lived from ca 400'000 ago until ca 8'000 ago.
16obD TIL When Al Capone reached prison he was diagnosed with neurosyphilis, and eventually paroled early based on his reduced mental capabilities.
b9wy7 TIL that the Doomsday Clock, a symbolic tool used by scientists to measure how close the world is to a man-made global catastrophe, is currently at “100 seconds to midnight”, the closest it has ever been since its creation in 1947.
Eg9EX TIL Sub-Saharan Africa has the highest rate of education exclusion globally, according to the UN. Nearly 60% of youth aged 15 to 17 are not in school.
7RMr TIL that the first Final Fantasy was programmed by a single developer who did not “fully understand what an RPG was”