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TIL The ceremony of the keys at the Tower of London has gone on almost uninterrupted for 700 years. It was late once during WWII due to a number of bombs hitting the guard room, knocking the guards and Yeoman warder over. The officer in charge personally wrote a letter to the king to apologise.

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8e6aP TIL in 1590, starving Parisians ground human bones into bread
01WM TIL scientists have created glow-in-the-dark cats by inserting the jellyfish protein that codes for bioluminescence into their genome
Ypbkr TIL that the Karen are an actual ethnic group of approximately 7.5 million Sino-Tibetan peoples. While the group as a whole is heterogeneous and disparate, some of the Karen, led primarily by the Karen National Union (KNU), have been in a constant state of war since the 1940s.
VBExk TIL that in fall when some tree leaves change color, the brown-red-yellow is actually their real color. The green was the chlorophyll used to absorb sunlight that is now broken down and reabsorbed into the trunk to save energy and reuse for next year's new leaves
KYXAB TIL that Saudi Arabia is planning to construct a 1600 ft tall, 75 mile long skyscraper in their arid Northwest region at an estimated cost of $100-$200 billion