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TIL whale calves are born in the water and need to swim to the surface for their first breath - sadly, some of them don’t make it and drown.

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KORJR TIL: In 2019 A Well Preserved Pleistocene Wolf Head and a Frozen Cave Lion Cub were Found by a Team in Siberia
yVdkl TIL that having a small amount of insulation on a cylinder (like a pipe or water heater) can actually make it lose heat faster than if it were entirely uninsulated. This is known as the critical thickness of insulation. Having more than the critical thickness makes the heat transfer rate go down.
mxJOE TIL John Gotti's 13 year old son was struck by a car and killed when he darted out into a street on a mini motorbike. The driver of the vehicle, a neighbor whose son had previously slept over at the Gotti house, disappeared 5 months later. He was allegedly shot in the head and dissolved in acid
JrXV TIL Near the bottom of the Grand Canyon, you can place your hand across a geological division where the difference in age between the rock touching your upward fingers and the rock touching the base of your hand is more than 1 billion years.
P1d1g TIL Ulysses S. Grant would include two groomsmen in his wedding: James Longstreet and Cadmus Wilcox. Seventeen years later, General Longstreet and General Wilcox would surrender to General Grant at Appomattox, ending the American Civil War.