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TIL the oldest ball court in the world is in Paso de la Amada in modern day Mexico, dated to 1400 BCE.

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nWyRB TIL That the Smoky Mountains are home to a temperate rainforest on a section of the mountains near Gatlinburg, Tennessee. Worldwide, this is a very rare ecosystem that is not experienced by many other locations on earth.
6Rxl TIL that when the US Navy refused to provide footage for the film Crimson Tide, the producers waited at the Pearl Harbor submarine base until a submarine left port, which they then pursued with a boat and a helicopter, filming as they went, until the submarine submerged.
Y79L7 TIL of the SnackWell Effect, the tendency of people to go overboard on something when they are given free pass (such as the low fat cookie the effect is named after). The effect is seen in other areas. For example, people with low-energy light bulbs tend to leave them on longer.
5YgwB TIL that US law requires that eggs sold in supermarkets must be washed. And EU law requires that eggs sold in supermarkets must NOT be washed. Both do it to prevent salmonella.
dDNaK TIL that romantic comedy director Garry Marshall created Happy Days, and is the brother of director Penny Marshall