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TIL that mice are terrified by a chemical signal produced by cats, rats, and other predators. These chemicals led the mice to stop or stay close to the ground while they carefully assessed their surroundings.

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b6yyp TIL that the Manhattan Project produced a short book on how to build an atomic bomb. "The Los Alamos Primer" is 24 pages and completely declassified. Freeman Dyson wrote that the guide should not have been published, because it tells readers that "bomb designing is fun".
yVQlp TIL President Jimmy Carter visited Three Mile Island during the disaster, not for a publicity shoot but because he was a trained nuclear engineer and wanted to know what was going on personally
m10dv TIL Red Bull’s famous slogan “Red Bull gives you wings” was changed to “Red Bull gives you wiiings” after a $13million lawsuit that accused the company of “fraudulent advertising” because the drink did not give people wings or elevated abilities of any kind.
WeJB TIL Reichsmarschall Hermann Göring’s younger brother Albert despised Nazism, and offered active resistance to the regime, including helping prisoners escape from concentration camps. He was arrested four times, but Hermann secured his release each time.
nepp7 TIL of Joy Milne, a “super-smeller” who found she could smell a unique odor on people with Parkinson's disease years before the onset of symptoms. Scientists then isolated biomarkers in sebum (oily substance from face/back) of Parkinson’s patients, paving the way to earlier detection/treatment.