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TIL of the incredible variety of Indigenous Cultures and Languages in Central America, with Mexico alone having over 60 officially recognised languages and cultures, with a range of genetic diversity between the different groups greater than that between Western Europeans and S.E. Asians.

ANOyn TIL of August Kubizek, a friend of Hitler when they were teenagers. It was only thirty years later after Hitler abruptly cut off communication with Kubizek that Hitler rekindled his friendship with Kubizek in 1938. After the war, he wrote a book called "The Young Hitler I Knew" in 1955.
M7Jla TIL of wind catchers, an architectural technology dating back to 500BC Iran to passively cool buildings. Air is drawn in and out of these tall spire like structures through large slotted openings at the top. A stream of water underneath provides evaporatively cooled air which rises through the space
oEx7 TIL of the World Health Organization “Cocaine Project,” which was banned from publication because it concluded that, “occasional cocaine use does not typically lead to severe or even minor physical or social problems,” among other positives
78m1X TIL that in 1878, US Supreme Court Justice Ward Hunt suffered a stroke which thereafter left him unable to either attend court sessions or to render opinions. Yet he refused to resign for another 4 years, his sole reason being to stay long enough to claim his pension.
rNXm4 TIL that before ice cream cones were invented, people used "penny licks" to eat ice cream from street vendors: a small glass which the customer would lick clean and return to the vendor. They were banned in 1898 due to concerns about the spread of disease, particularly cholera and tuberculosis.