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TIL a capitonym is a word that changes its meaning (and sometimes pronunciation) when it is capitalized such as Polish and polish.

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grB17 TIL that platypuses (platypi?) don't have nipples and secrete milk through their abdominal skin. Also there are no known pain relief medication that can treat platypus venom, since the venom affects unknown pain response pathways in humans
R5v77 TIL about the "de Lackner HZ-1 Aerocycle" which was expected to become the US' standard reconnaissance machine. Unveiled in 1954, it required the unlucky user to stand on a platform above four whirling blades, which he then steered by tilting his bodyweight in the direction he wished to move.
5NAQ TIL that if you leave lime juice on your hands on a sunny day, your skin can get second degree burns and be discolored for YEARS… It’s called “margarita dermatitis” because people often get it while making margaritas outside!
lVnK TIL Dr. Dre was the highest paid musician in 2014, earning $620 million compared to second placed Beyonce who earned $115 million. This was the widest margin in history between first and second place.
P11BE TIL that the Voyager 1 Space probe launched by NASA in 1977 has traveled over 14 billion miles away from earth as of 2022.