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TIL that typewriters used to not have an exclamation mark on them, or even the number 1, both had to be approximated by typing other characters in their place. 1 was a lowercase L and exclamation marks were the combination of an apostrophe and period.

wdlY TIL that one day in 1880, three men from Arkansas, searching for a wildcat, stumbled on a mysterious cave whose inside was covered in a radiant blue color. The three men immediately fell ill and were covered in sores after leaving the cave. They had discovered the first radium mine in America.
mR8x TIL University of Cambridge researchers studying animal cooperation found elephants learned even faster than chimps; “elephants’ understanding of the need to cooperate shows that they belong in an ‘elite group’ of intelligent, socially complex animals.”
loyaK TIL that there is a Guinness World Record for the tallest stack of M&M's. Will Cutbill currently holds the record of 5 M&M’s.
vveR TIL A boy who’s circumcision was botched was given a sex change suggested by his doctor. Later, it was discovered the doctor was conducting an experiment trying to prove that gender identity is primarily learned. The boy killed himself at 38 years old.
e0kj6 TIL the oldest monument in Paris is over 3,000 years old. The Ottoman ruler of Egypt gave a 75 ft, 250 ton ancient Egyptian obelisk to France in exchange for a mechanical clock in 1833. The obelisk was placed in the center of the Place de la Concorde where it stands today.