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TIL in 1945, at 59 years old, Albert Stevens was misdiagnosed with terminal stomach cancer, and as a result was secretly injected with 131 kBq (3.55 μCi) of Plutonium as part of a human experimentation project by Joseph Gilbert Hamilton. It was later discovered the "cancer" was an inflamed ulcer.

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GY9DQ TIL William Wrigley Jr. began by selling soap and offered baking powder as an incentive to buy it. Finding the baking powder more popular, he switched to selling it instead and gave his customers gum as incentive. Again, he found that the gum was more popular and began to sell it instead.
OGAk1 TIL that Andrew Johnson is the only United States President to serve as a senator after his term as president, with his term as Tennessee Senator lasting from March 4, 1875 until his death on July 31, 1875.
eDEb TIL whenever a pirate stopped a merchant ship, it was not uncommon for a handful of merchant crewmen to join the pirates.
d8kpB TIL that Einstein hated wearing socks. In a letter to his wife he said that the reason he stopped wearing them was because his big toe always ended up making a hole in them.
0wl7A TIL that Winston Churchill invented, designed and named the Romper