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TIL that in WW2, US used Native Americans for message encryption. They were called "code talkers" as they simply talked in their native language for transmitting the messages. This allowed fast communication over open channels as enemy was unable to break this code. Was crucial in winning the war.

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m66O TIL that because of different bacteria living on man/woman’s body, man’s sweat smells like cheese and woman’s smells like onions.
oBlr TIL The Great Lakes consist of only 4 bodies of water. Lake Michigan and Lake Huron are actually geographically and hydraulically a single lake, separated only by name. This actually makes it the world’s larges lake, as opposed to the popularly believed Lake Superior.
gwvD TIL of Mariya Oktyabrskaya, who’s husband died in WW2 so she sold all of her belongings and built a tank “The Angry Girlfriend” for revenge. She became the first female tanker to ever win the Hero of the Soviet Union award
gM5GD TIL that the furthest detected individual star is 14.4 billion light years from Earth. We can detect it from so far away because gravity from objects between us and the star have warped its light, magnifying it 2000 times and focusing the star's light onto Earth for telescopes to pick up.
AwOl TIL that in 2008 13 babies in China died after ingesting a formula made with melamine which the company added to make it look like it had a higher protein content. Two of the owners of the company involved were actually executed.