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TIL in the Battle of Schöngrabern, during the Napoleonic Wars, the French captured a bridge over the Danube at Vienna by falsely claiming that an armistice had been signed, and then rushing the bridge while the guards were distracted.

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VMWvZ TIL In 1914, the exchange rate of the German mark to the American dollar was about 4.2 to one. Nine years later, it was 4.2 trillion to one. The price of a loaf of bread went from 250 marks in January 1923 to 200 trillion in November.
0wrn5 TIL the CIA had a mind control program. In 2018, declassified documents included a letter discussing work on six dogs made to run, turn and stop via remote control and brain implants.
ONdg TIL of denatonium benzoate, the most bitter compound known to science. Its primary use is as an additive to poisonous household chemicals to discourage consumption.
e0dw5 TIL that the Heaviside Layer, best known for having to do with reincarnating cats in the musical "Cats," is real, and is the reason why you can hear further radio stations at night.
xVQXw TIL: The term coevolution is used to describe cases where two (or more) species reciprocally affect each other's evolution.