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TIL soldiers were used as “guinea pigs” to study the effects of radiation on human health by French government in 1960s

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x8bD TIL Noah Webster, the founder of Merriam-Webster, learned 26 languages in order to evaluate the etymology of words
9YQY7 TIL about the hidden holocaust, better known as the "Congo Horrors" caused by King Leopold II of Belgium. The magnitude of the population fall over the period is disputed, but it is thought to be as high as 15 million people.
nWVVP TIL about Unsinkable Sam, a ship's cat who purportedly served during World War II with both the Kriegsmarine and the Royal Navy and survived the sinking of three ships. The Sinking of the Bismark, the Sinking of the HMS Cossack, and the sinking of the HMS Ark Royal.
9YXNp TIL about the blanket octopus, named for the sheets of thin webbing between its arms. Females can reach over 6' (1.9m) in length, while males are approximately the size of a walnut. This is the most extreme case of sexual size dimorphism found in nature.
byA9 TIL an 80 year old woman was killed in a Brazilian clinic when a student nurse accidentally administered coffee and milk through her IV line.