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TIL that the US uses customary units of measurement that, prior to 1959, were slightly bigger than the imperial system units. The Mendenhall Order established a set conversion rate between the US and metric systems, causing discrepancies with the imperial system over time.

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O64R TIL that Palestinian-American activist Alex Odeh was killed in California by a bomb. Three suspects linked with the Jewish Defense League fled to Israel before they could be arrested.
mxZVp TIL that Ernest Hemingway lived through anthrax, malaria, pneumonia, dysentery, skin cancer, hepatitis, anemia, diabetes, high blood pressure, two plane crashes, a ruptured kidney, a ruptured spleen, a ruptured liver, a crushed vertebra, and a fractured skull.
b9JZ0 TIL that after President Kennedy was shot Jackie Kennedy wore her blood-soaked, pink dress to both the hospital and the swearing in of President Johnson. The unlaundered suit was donated to the National Archives and Records Administration and will not be placed on public display until 2103.
v1mAL TIL about Missouri Compromise. It determined that in states located south of the 36°30' parallel, slavery was allowed. Every time the United States expanded west, two states would be created, one pro-slavery in the south and other anti-slavery in the north to keep the balance of power.
GvMg TIL Canadians make a candy called tire d'érable by pouring maple syrup on snow, then rolling it onto sticks.