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TIL the hoover dam is expected to last 10,000 years

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wobXP 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
Eklo TIL Citizens of Monaco are not allowed to gamble at the Casino in Monte Carlo. Passports are checked to enforce this.
5YBgB TIL that Issus Coleopratus nymphs have functioning mechanical gears on their thighs that they use to synchronize their leg movements when jumping
ema5 TIL that a whale’s ear wax builds up over the course of its life and can be analysed like tree-rings.
wLYv8 TIL that Nikola Tesla predicted the modern cell phone in 1926: “We shall be able to communicate with one another instantly, irrespective of distance. Not only this, but...we shall see and hear one another as perfectly as though we were face to face... a man will be able to carry one in his pocket”