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TIL an FBI informant investigating corruption in LA jail was transferred to different jails, kept in isolation, held under various aliases, and watched around the clock to prevent FBI handlers from finding him. The corruption included brutality and staging “gladiator style fights” between inmates.

l7DLA TIL in the 1950s Coca-Cola wanted to raise the price of a Coke above 5¢, but their vending machines only took single coins. Not wanting to double it to 10¢, Coke asked the US to mint a 7.5¢ coin, but were denied. So it made every 9th bottle in the machines empty, making the avg effective price 5.6¢.
GYwPg TIL that the fattest animal on earth is not a manatee or a whale but the 1½ inch Miller Moth Caterpillar (aka army cutworms). With 72% body fat it is more calorie-rich than elk or deer.
dpjQ TIL those weird times when you learn some new random or obscure piece of information and then proceed encounter it all over the place or run into it conversation soon afterwords does in fact have a name: The Baader-Meinhof Phenomenon.
pYEWb TIL that at age 16, Einstein took the entrance exam for the college, Swiss Federal Institute of Technology, and he failed it. The language and history sections were the sections he struggled on. He did well on the math and science sections.
vr0r TIL of Dr. Jerri Nielsen, a doctor stationed at the South Pole who diagnosed, biopsied and treated her own breast cancer during the overwinter period when the crew is normally isolated from the outside world. In complete darkness, medical equipment had to be airdropped from military aircraft.