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TIL the Aztec capital Tenochtitlán was the largest city in the Americas with over 200,000 people. It was built on a man-made island in the middle of a lake - connected to shore by 3 causeways. It contained huge pyramids, floating gardens, aqueducts and canals. It was destroyed by the Spanish in 1521

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ADj9n TIL that despite having a population of just 650,000, Memphis, Tennessee has the world's largest cargo airport, shipping more tonnes of cargo per year than Los Angeles and Dubai combined
XEL7E TIL the actor Kurt Russell was probably the first person to officially report the Phoenix Lights (one of the largest UFO sightings of all time). He was a flying a plane into Phoenix at the time and reported it to air traffic control.
KOJeJ TIL In 2008, Mike Schultz, a pro snowmobile racer, had his left leg amputated above the knee. Seven months later, he was zooming around on a dirt bike wearing a prosthetic leg that he designed and built himself. X Games 8x gold medalist motocross snowcross and Gold Silver paralympic Snowboarding.
DQQAe TIL Chinese Checkers was invented in Germany in 1892 under the name "Stern-Halma" as a variation of the older American game Halma. The name "Chinese checkers" originated in the United States as a marketing scheme.
PY8BV TIL that to punish tree thieves who cut down trees illegally, some cities spray trees with fox urine around Christmas time. It freezes on them and is odorless outdoors, but would stink up your whole house if brought indoors; the smell is "eye-watering."