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TIL that Ancient Romans used to use urine as mouthwash. The ammonia in urine was believed to have a whitening effect on teeth.

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dpRZ TIL To conceal where Genghis Khan was buried, escorting soldiers killed everyone they saw, then they killed the tomb-builders, then they killed each other.
xJ4k TIL the TV series Captain Planet was the first children’s show to deal with HIV-AIDS. The episode involved a villain brainwashed a community, making them think HIV could pass on just by casual contact, making the entire town hate a young man infected by HIV, voiced by Neil Patrick Harris.
wrP1 TIL, a parchment manuscript was erased by a 13th-century monk to write a Christian liturgical text. The erased manuscript was originally written by Archimedes and contained some of the fundamentals of modern calculus, which wouldn’t be developed for almost another 2,000 years.
d8W1K TIL that George Washington moved his slaves in and out of Pennsylvania every 6 months to avoid them taking advantage of a law that meant slaves residing in the state longer than half a year could claim freedom
v1jo8 TIL one of the lost Faberge eggs from Imperial Russia was discovered in 2012 after the owner, a scrap metal dealer, struggled to sell it because prospective buyers thought he was overestimating it’s worth in gold and jewels. It was later valued at £20million.