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TIL that transmissible spongiform encephalopathies (also known as prion diseases) have the highest mortality rate of any disease that is not inherited: 100%

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lojya TIL that by international agreement, a meter is defined as the length of the path travelled by light in vacuum during a time interval of ​1⁄299792458 second.
XED4X TIL that the most successful pirate in history was a Chinese woman named Ching Shih. She commanded the Red Flag Fleet which consisted of 300 ships and 40,000 pirates. She was also one of the only pirates to actually retire.
9Ywwp TIL that there is a mushroom in Oregon that is roughly 2,400 years old, and has a root system that covers over three square miles of land.
9Yvgm TIL That until the 10th century there was no set way of appointing the pope. Pope Fabian was made pope because a dove landed on his head at an opportune time.
BrKjy TIL the 2007 horror movie "Paranormal Activity" was made on a budget of $15,000 and grossed $193 million at the box office.