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TIL The word 'bug' to describe a defect predates electronic computers. In 1931, Baffle Ball, the first mechanical pinball game, was advertised as having "No Bugs in this Game!"

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5VMmQ TIL a cat’s tongue is made out of keratin, the same material that makes up human fingernails
YpD4G TIL the album “Blurryface” by Twenty One Pilots was the first to have every song certified as at least gold
GYR54 TIL that a pestilence very likely killed the Aztecs: within five years, 15 million people – 80% of the population – were wiped out in an epidemic named ‘cocoliztli’, meaning just pestilence
9wA9B TIL that trees existed for tens of millions of years before other organisms developed enzymes to digest them. Dead trees just laid on the ground and didn’t rot.
GYRkQ TIL a Toronto man built a wooden staircase for safe entry to a park for $550 after he learned that the city-made staircase would cost $65K-150K. Although it was removed by city staffs due to safety concerns, the mayor called and thanked him for his effort, and a new stairway was built for $10K.