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TIL that Greenland Sharks born around the time of the American Civil War are still juveniles. The maximum lifespan of a Greenland Shark is ~400-500 years old.

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AN7J7 TIL of the proposed Overwhelmingly Large Telescope, whose 100m aperture would have allowed it to see objects 1500x fainter than the Hubble Telescope and analyze extrasolar planets for molecules indicating life. It was cancelled due to the €1.5 billion cost being too high
5YEeP TIL that Saturn has a moon that bears a striking resemblance to the Death Star from Star Wars. This moon, Mimas, wasn't observed in detail until the Voyager spacecraft captured photos in 1980, three years after the release of the first Star Wars movie.
gMGx7 TIL there is a little known island in New York City called Hart Island that has been used as a burial ground for poor or unidentified people for decades, and in 2012 Hurricane Sandy's heavy storm surge tore at its shore revealing hundreds of human bones.
OoJNX TIL that the bird, Turkey (like the country) is Peru (like the country) in the Portuguese language
jNOpQ TIL The Lily family of plants are extremely toxic to cats and can cause kidney failure withing 48 hours