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TIL the underground quarries of Paris, which house the city’s catacombs, were once used as a mushroom farm, as they allowed better cultivation all year round. By 1880, up to 300 mushroom farmers produced more than 1000 tons each year.

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0w6Rv TIL in 1900 A category 4 hurricane was raging through the Bahamas. The advanced weather stations in Cuba tried to inform the US Weather Bureau that it was headed west to Texas. They ignored the Cubans and claimed it was headed north instead. The hurricane hit Texas killing up to 12,000 people.
w1VY TIL many color laser printers employ ‘hidden’ dot codes that encode the serial number of the specific printer on every printed page to make your documents forensically tracecable back to the printer. The EFF believes printer manufacturers agreed in secret with governments to provide this tracking.
lY5A TIL In 1924, German shoemaker Adolf Dassler let his brother, Rudolf, join his sports shoemaking company. During WWII, they grew to hate each other and in 1948, Rudolf started his own company across town. Adolf, aka Adi, changed his company’s name to Adidas; Rudolf started Puma.
j6RoR TIL about Neil Harbisson, the world's first officially-recognized cyborg. He has an antenna surgically implanted into his skull through which he can receive information in the form of vibrations.
6RGX TIL that Crayolas “Peach” color was named “Flesh” until 1962. It was considered racist to imply that flesh is or should be that color.