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TIL the National Institutes of Health concluded in a 2019 analysis that PFAS are in the blood of 97 percent of Americans.

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Kdw TIL that Albert Michelson, celebrated for his work in discovering the speed of light, got a free education at the US naval accademy just because he hung out by the door to the Whitehouse and went (initially uninvited) for daily morning walks with the President (Grant).
DQd9D TIL: The chemical compound Geosmin is not only the source for beets earthy taste but also the distinct smell after it rains.
m1aYo TIL of Operation Plumbbob, where a nuclear bomb was detonated in a vertical tunnel with a 2,000lb (900kg) metal plate plugging the surface. The plate was launched into the air at 6 times Earth's escape velocity
QBpa TIL that Mahatma Gandhi’s assassin is seen as a patriot by many Indians. This has led to attempts to create a glowing documentary of him, install busts in his likeness in political buildings, and even build a temple in his honor.
PYLJ TIL during the Chernobyl, three engineers volunteered to dive into a pool of radioactive hydrogen peroxide with no working flashlights and open a pipe to stop the reactor from exploding. They succeeded.