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TIL The United States almost converted completely to the Metric System with the Metric Conversion Act of 1975. Reluctance and the Reagan administration’s effort to reduce federal spending prevented it.

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0wnmR TIL the popular door knock "dah dah dah dah dah...dah dah" is know as the "Shave and a Haircut" and was used by POWs during the vietnam war to identify new US prisoners. They would tap the first five notes, and wait for the last two notes in response
w4K1 TIL the State of Kansas is literally flatter than a pancake.
pYwpQ TIL about the "Raines sandwich;" an inedible piece of "food" that served as a way to bypass prohibition laws.
6E55m TIL Aeschylus, the ancient Greek tragedian, was killed when an eagle mistaken his bald head for a rock and tried to shatter the shell of a tortoise on it.
9m0G TIL there are less than 100 Javan rhinos left in the entire world, and they are all located in one national park.