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TIL the dunk tank evolved from a carnival game called African Dodger

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Z81Qa TIL Following the first successful powered flight in 1903, the Wright Brothers took their invention to a cautious War Department, who were skeptical due to past false claims. Incensed that their good word was not accepted, and worried about weak patent laws, the Wrights hid their invention away.
xrX5 TIL CIA agents in the 50’s used different lacing patterns to secretly communicate
D1ynv TIL, The Blue Whale, largest animal on Earth which can grow to over 30 meters long, evolved from a land animal named Pakicetus that lived around 50 million years ago. Pakicetus was a four-footed mammal about the size of a wolf and it lived around what is now Pakistan.
oBBQR TIL that in 2005, an interactive real-world game called Perplex City was created. It featured different puzzle cards and was solved in 2007. However, one card remains unsolved. Card #256 shows a picture of a man with the message: "Find me." No one has found him to this day.
aw8mJ TIL wealth and power cause brain damage that effects empathy and being able to see things from other's point of view.