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TIL in the 1940s and 50s MIT scientists fed unsuspecting boys oatmeal laced with radioactive materials at a school for mentally disabled and abandoned boys

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xEeg TIL the average infantryman in the South Pacific during World War II saw about 8 days of combat in a year. The average infantryman in Vietnam saw about 240 days of combat in one year.
xMZ5 TIL that in Feudal Japan, there was an untouchable caste comprised of “impure” professions such as executioners, undertakers, workers in slaughterhouses, butchers or tanners. 400 years later, descendants of this caste may still face discrimination.
DxND TIL shark fetuses fight and eat each other while still in the womb. The one that is left alive is the only one that is born.
OAkY TIL Diesel engines produce very little carbon monoxide and will not kill a person trying to commit suicide by carbon monoxide poisoning.
R5yV4 TIL that it is unknown how to properly pronounce "Halley's Comet"