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TIL For five hours and 29 minutes Mercury will be visible crossing the sun on November 11, 2019. It will be one of 14 such transits in the 21st century – the last one occurred in 2016

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VBVJp TIL that there is a disease that is called “Maple Syrup Urine Disease”
m8YY TIL that there are at least 10 gems more rare than diamonds and some of them will change color depending on the light you see them in.
69p07 TIL During World War II (1942-45), the U.S. forcibly relocated and incarcerated around 120,000 people of Japanese descent—two-thirds of whom were U.S. citizens—in ten camps run by the War Relocation Authority.
KOpv4 TIL of the Inughuit of northwest Greenland, the world's northernmost people. When contact was made in 1818 they had been isolated for several hundred years and were completely unaware of the existence of other humans.
epl9b TIL the Yellow River's infamous floods aren't the river simply overflowing its banks and returning to its original course. When uncontrolled, the river changes course frequently and wildly; some episodes see the river's mouth shift as far as 480 km.