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TIL that man by the name of John Leal put chlorine into a city’s water supply unbeknownst to anyone else which eventually landed him in court. His work would go on to cut the infant mortality rate in half and dropped the rate of death for typhoid nearly to zero.

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dop9 TIL The Tomb of the Unknowns has been continuously guarded without interruption since 1937. There are wear marks in the marble from the sentinels footsteps
m14JE TIL Arsenic was known to be dangerous and addictive in the Victorian Era, but small amounts in the form of edible wafers were thought to not only be safe but to help one achieve that sought-after pale complexion, giving the skin an "indescribable brilliancy" according to advertisements.
P1b4V TIL: DC Comics enraged “Fables” creator Bill Willingham so much that in 2023 he made the comic public domain and encouraged its use by creators, which effectively undermined the publisher's efforts to control the property. DC had published "Fables" for 20 years but Willingham retained copyright.
N7nBe TIL There's an island in Liberia where chimps used for scientific experiments are sent to after retirement. This island has kept them segregated from the rest of the country's primates for 50 years. A team of locals are paid to row out and feed them regularly.
rNWg4 TIL before the invention of the American football helmet in the 1890s, players would often grow their hair long because they believed it protected them from head injuries.