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TIL That there is a community in Cairo, Egypt that collects the trash of the residents of Cairo and recycles upwards of 80% of it. Nicknamed "Garbage City", these mostly Christian residents have been collecting and recycling Cairo's trash for several decades.

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xVmDb TIL that since 2009, more people moved to Mexico from the US than moved to the US from Mexico.
a50J TIL of Kilroy Was Here, a popular meme that originated with US soldiers in World War 2 that was graffitied on landmarks as the soldiers moved on
1eE8 TIL that nuclear power plants in the US are so strong that they can be struck by a large commercial airliner and still not release harmful radiation
1aGyV TIL that early phonographs didn't have volume control. People stuffed socks and towels into them to quiet them--which is where we get the phrase "put a sock in it"
NXd68 TIL Greenland's name was made by Erick the Red hoping that the pleasant name would lure other settlers to the island. To some extent, the trick worked because several Vikings from Iceland who were escaping famine managed to establish some settlements in Greenland after a few years.