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TIL that Leonardo da Vinci designed a robotic knight operated by cables. When modern engineers built a replica based on the designs, it was functional.

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vwBx TIL that the world’s shortest commercially available flight is only 2 minutes long; can be as short as 47 seconds in ideal conditions!
xnm7 TIL Nickelodeon’s Iconic Slime Is Made Of Vanilla Pudding, Applesauce, Oatmeal, and Green Food Dye.
8a6aV TIL of a giant "WELCOME TO CLEVELAND" sign on a rooftop in the flight path of a Milwaukee airport. It has been causing confusion to passengers since 1978. Creator, Mark Gubin, said: "Living in the world is not a dress rehearsal. You better have fun with it."
xVELw TIL that everyone is actually blind in one part of their vision, and you can easily see this in action right now with a simple test. The cause is nerve fibers blocking the retina, and your brain just fills in this spot with surrounding images, so you don't normally notice it.
pYWJp TIL that, at the time of Sweden's first census, the population was so much lower than expected that the Swedish government hid the information as to not reveal to other countries how little manpower they really had.