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TIL about the Oh-My-God particle; an ultra-high-energy cosmic ray detected on 15 October 1991. As of 2023 it is the highest-energy cosmic ray ever observed and the time of its detection it was traveling at 0.9999999999999999999999951 times the speed of light.

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69eEY TIL: Wrought iron is no longer produced. Many products described as wrought iron, such as guard rails, garden furniture, and gates are now made of mild steel.
wY1P TIL George Clooney got into a fistfight with Three Kings (1999) director David O. Russell on the set. Russell had yelled and derided a few extras out of frustration and Clooney didn’t appreciate it. Russell has since said, “I wouldn’t make another George Clooney movie if they paid me $20 million.”
lm61 TIL that researchers in the 1960s attempted to teach dolphins the human language. This experiment escalated when the female researcher started to masturbate the dolphin and then later taking LSD with the dolphin.
Ogy6 TIL In Russia, it is illegal to tell kids that gay people exist
RVb6 TIL that the voice pattern characterizing a subset of gay males, the “gay lisp,” does not appear to be biologically driven, but may instead be related to childhood gender nonconformity.