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TIL an unknown species of spider constructs Stonehenge-like structures out of silk

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Me0k7 TIL of the greenheart tree, whose wood is so strong it cannot be worked on with regular tools
Om5Y TIL The Great Clock of Westminster, commonly referred to as Big Ben, withstood about a dozen attacks by German bombers during the Second World War.
KYdEJ TIL - Since 2014, the Saudi company Fondomonte has been pumping unlimited amounts of groundwater in the desert west of Phoenix to harvest thousands of acres of alfalfa crops. The alfalfa is then shipped back to Saudi Arabia to feed their cattle.
9YVnG TIL that In 1880, Doctor Washington Sheffield of New London, CT manufactured toothpaste into a collapsible tube. He had the idea after his son traveled to Paris and saw painters using paint from tubes
ARp7 TIL that North Korean dictator Kim Jong Un was elected with 100% of the votes. The ballot listed only him. Citizens are allowed to cross out his name and write in a new one, but they must step outside the election booth to do so, and write down the new name in front of election officials.