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TIL Phones have an asterisk and pound sign because when Bell Labs designed the first touch-tone phone, their system had two tones which were not assigned values. So, they threw in * and #.

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OG5vR TIL about he Hairy Frog, also known as the Wolverine Frog. When threatened, it breaks it's own toe bones so that the sharp ends stick out of it's toes like the X-men's Wolverines claws. The toe bones eventually retract and grow back in place as the tissue heals over the hole.
Nlmb TIL The loudest sound on Earth is a volcanic eruption and it can kill you on the spot.
gVJy TIL identical twin boys were raised as a brother-sister pair (botched circumcision). The truth came when the one being raised as a girl INSISTED he was a boy; the parents admitted he was the subject of an experiment trying to prove gender identity was nurture, not nature. He later committed suicide.
JOpl TIL in 1914, Mexico arrested nine U.S. sailors in Verecuz for trespassing. The U.S. demanded the release of the sailors, an apology, and a 21 gun salute. Mexico released the sailors and issued an apology, did not give the 21 gun salute. The U.S. responded by invading and occupying the city.
rNkLy TIL: Chuck Feeney, a billionaire, secretly gave away his wealth, seeking no acclaim, while living modestly—preferring economy flights, a $15 watch, and owning neither homes nor cars.