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TIL the ice on a hockey rink is painted white to make it easier to see the puck

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PYGOZ TIL Female urine was injected into frogs as a part of the first mainstream pregnancy tests.
OG711 TIL Enamel is made of powdered glass
b97Q4 TIL that the FBI tried to blackmail MLK into committing suicide.
QNRkM TIL Abraham Lincoln signed into a law that began the IRS and was the USA’s first income tax. It was done to help pay for civil war expenses
gMQNL TIL precolonial Mesoamerican maps depicted both geographic features AND its history using logographs showing what an area was (i.e. a hill) and what happened there (i.e. glyphs for battles etc). As it told their stories, Native city-states used their city-maps as state symbols, akin to modern flags