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TIL John Romero and John Carmack once build a demo of Commander Keen to position themselves as capable of building a PC version for Super Mario Bros. However, although Nin was impressed with the efforts. The company wanted Mario series to remain exclusive on their consoles

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788JL TIL it was theorized through the 19th century that the Arctic Ocean got warmer as it got closer to the North Pole. The "Open Polar Sea" could provide trade routes through an equator-like temperate climate to Asia, Europe, and the Americas. It was disproven by dozens of failed expeditions.
4Xp5g TIL Titanium is used in medical implants because it is one of the few metals that your body will not eventually attack as a foreign object. Because of this, eventually bone will bond to the metal without adhesives and grow around it.
4XMWX TIL that Lon Chaney's makeup for The Hunchback of Notre Dame caused him permanent pain and vision loss.
69GWZ TIL the Triforium, a six-story sculpture near Little Tokyo in Los Angeles, was supposed to track the motions and conversations of people near it and convert them into patterns of light, and also point giant lasers toward the sky spelling out "Los Angeles." But its artist designer ran out of money
E1Q80 TIL the Black Footed Cat of South Africa is the smallest cat in the world weighing in at around 4lbs, yet is the deadliest cat on earth. This tiny, and by some accounts adorable kitty is capable of traveling 20 miles in a night and has a take down/kill accuracy of around 60%.