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TIL while working on a heart rhythm recording device, Wilson Greatbatch mistakenly installed the wrong resistor, causing the device to emit electrical pulses instead - leading to the invention of the implantable pacemaker.

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oBk47 TIL a Doberman in India died protecting its owners from 4 mountain cobras, fighting them for 4 hours. He killed all of them, but then died from poison from multiple snake bites. Hundreds of people paid their respects to him, laying floral wreaths on his body, and held a funeral procession for him.
0wywN TIL, a Donald Duck cartoon about Hitler won the Best Animated Short Oscar in 1943.
BlxL TIL that Dragonflies have a high power/weight ratio, and have been documented accelerating at 4 G linearly and 9 G in sharp turns while pursuing prey.
kJeO5 TIL of Stephen Hawking's reply to Einstein's famous quote "God does not play". He replied "Not only does God play dice but he sometimes confuses us by throwing them where they can't be seen."
WyXN TIL there is a bright pink millipede that is able to ‘shoot’ cyanide.