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TIL plumbers call the day after Thanksgiving "Brown Friday", their busiest day of the year,

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mxpPp TIL Manhattan was sold for $24 in buttons and cloth by the Native Americans to the Dutch
PY7re TIL that in the early 19th-century the planet "Vulcan" was believed to actually exist in our solar system. Oddities in the orbit of Mercury led mathematicians to predict the presence of another planet closer to the sun. Later, Einstein's new theories of relativity helped disprove that hypothesis.
p8jQQ TIL about absorption cooling: freeze things by burning stuff (or using residual heat from other processes, such as water heating). Patented back in 1859-1860, with the first commercial application in 1925, this process is still used today in gas powered refrigerators, typically found in RVs.
4kgXN TIL The UK's Copyright, Designs and Patents Act of 1988 has a special provision for Peter Pan
neQ0G TIL, the Shibuya Crossing, located in the Shibuya Ward, Tokyo, is said to be the busiest pedestrian intersection in the world. At peak times, over 1000 people cross at the same time, coming from all directions, and there is almost no loss of foot traffic at midnight or early morning.