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TIL May is National Masturbation Month, and the 28th of May is celebrated as National Masturbation Day

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xXLk TIL the Manhattan Project secretly tested the effects of radiation on its own citizens, including injecting pregnant women and feeding schoolboys radioactive oatmeal.
D1pQV TIL It’s hypothesized that warm-bloodedness evolved in mammals and birds because it provided defense against fungal infections. Very few fungi can survive the body temperatures of warm-blooded animals. By comparison, insects, reptiles, and amphibians are plagued by fungal infections.
lBb7 TIL: Today I learned: The World Health Organization classifies tanning beds as a Level 1 carcinogen, the same as plutonium and cigarettes.
WkbbX TIL in 1971 Roger Daltrey of The Who convinced his bank to lend him £39,500 for a house by having them believe that, as a major star, he was a millionaire. However, due to reckless tour spending The Who actually were £600k in debt at the time.
4NAw TIL that readability tests suggest most Wikipedia articles are too sophisticated for their readers.