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TIL of the Sword of Goujian, a completely untarnished 2000-year-old sword that was found in an ancient Chinese tomb. It also has an unusual sharpness for its age. This is due to its unique copper composition and the air tight scabbard it was found in, keeping it sealed from the elements.

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GVyG TIL that there is a search engine called Shodan (after System Shock’s main antagonist) that can not only find things that Google can’t, but can be used to control or hack into systems such as traffic lights and security cameras.
AD6p7 TIL: Human hair rejected by wigmakers and sent from hair salons is being used to create oil adsorbing booms for ocean oil spills. Hair can adsorb 3-9 times its own weight in oil.
WkBK8 TIL the deepest hole in the world is 12 miles deep, 9 inches wide, and took 2 decades to drill
BrmWL TIL: Atari released the first memory game, called Touch Me in 1974. It wasn't terribly popular, and people who saw it later assumed it was a rip-off of Milton Bradley's Simon. They also released a handheld version later.
6rd7 TIL When an English police officer was stabbed he remarked “A scene from the film Hot Fuzz kept rolling through my mind. It was where policeman Simon Pegg gets stabbed and he says ‘It’s the most painful thing I’ve ever experienced.’- It literally is the most painful thing I’ve ever experienced.”