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TIL: Due to the Flint Michigan crisis, a study dubbed the Truth Fairy Project was done on baby teeth and the exposure to lead. Baby teeth provides easy to use info on lead levels. This led to evidence that there is no such thing as a "safe" threshold of exposure.

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via reddit.com

pYAl4 TIL That from the 1940s to the 1960s Lysol was used as contraception and a feminine hygiene product.
XEX46 TIL the Japanese work philosophy of “kaizen”, where people constantly seek to find ways to improve methods instead of just doing it the same way
9YWeB TIL in 1889, President Harrison signed identical documents that created North and South Dakota as states. No one knows which state was the 39th or the 40th to enter the Union because Harrison signed the documents blind and declared, “They were born together; they are one and I will make them twins."
awEJ0 TIL The Democratic Kampuchea period of 1975-1979 saw the closure and destruction of schools in Cambodia. During this period Phnom Penh University and all other educational institutions were closed and education was perceived as a dangerous asset
epEZn TIL that Vermont was its own independent government from 1777 to 1791.