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TIL that the laser sight used in The Terminator (1984) was a prototype that needed 10,000 volts to turn on. To use the weapon on screen, production hid a battery in Arnold Schwarzenegger's jacket and ran wires up the sleeve to attach to the sight

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PYn9V TIL In 1942, the Nazis cracked the algorithm for the serial numbers and rag content of British Pound notes. Using prisoners with counterfeiting skills, near perfect bills were produced with the plan to scatter them over England by air to induce hyperinflation and collapse the economy.
XELdr TIL, potential new antibiotics were discovered due to research into folklore that putting Russian brown frogs into a milk bucket would keep the milk from going sour.
gMmLb TIL President Lincoln was one of only 3 targets on the night he was assassinated. The Secretary of state was beaten almost to death that night, and the VP's assassin chickened out drunk in a hotel bar.
R5Dl9 TIL - The device reconnaissance aircraft use to measure the yield of a nuclear weapon is called a "bhangmeter."
kOeLd TIL that only 6.6% of the Hawaiian population is made up of native Hawaiians. (based on 2000 census)