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TIL that if the salt in the ocean was removed and spread evenly over the Earth’s land surface it would form a layer more than 500 feet (166 meters) thick, about the height of a 40-story office building.

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OoAY TIL that in 1962, American scientists detonated an H-bomb in space. There was no fireball because there wasn’t any oxygen, but the blast was captured in now unclassified film footage
j6Z9j TIL that the work of composer Antonio Vivaldi was almost completely lost until the 20th century, when violinist Fritz Kreisler published one of his own pieces as a fake "Vivaldi". This prompted a major resurgence in academic interest in Vivaldi, and his "Four Seasons" is now especially famous.
xV89g TIL that the Appalachian Mountains and the Scottish Highlands are part of the same ancient mountain range.
wrM8 TIL due to having no tools, an Inuit man once shat in his hand, shaped it into a knife as it froze, then used it to kill and skin a dog and make a sled out of its bones. He then strapped another dog to the sled so he could travel through a blizzard.
KYLlB TIL multiple 19th century French artists (including Alexandre Dumas, Charles Baudelaire, and Eugene Delacroix) were members of the "Club des Hashischins," a club dedicated to doing hashish and other drugs together and exploring their effects.