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TIL Macaws have a bite pressure of around 600 psi. A German shepherds bite is around 235 psi, and a tiger shark is around 325 psi.

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NXynP TIL that the Bluetooth logo is a combination of two Viking-Era Younger Futhark runes that are analogous to the Latin letters “H” and “B”, initials of King Harald “Bluetooth” Gormsson who united Norway and Denmark in 958 CE, and whose moniker is believed to come from the color of his dead tooth.
rOwd TIL that the Flinstones was originally sponsored by Winston cigarettes, and was intended for adults.
rNNbo TIL during WW2, Germany experimented with rocket powered submarines. They could reach underwater speeds of 28.1 knots (52.0 km/h; 32.3 mph).
5Yaer TIL of the Targa Florio, an automobile race through small mountain villages in Sicily, where spectators sat, stood right next to, or even on, the road, leading at least one race car driver to call it "totally insane." The race was held annually for around 70 years.
0oGR TIL that Astrid Lindgren, the author of Pippi Longstocking, at one point paid a marginal tax rate of 102%. She nevertheless supported the Social Democratic Party responsible for the tax rate her whole life.