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TIL That the Allies secretly built two entire portable harbors in the UK and towed them across the English Channel right after D-Day to attach to the just-captured beachheads. One was damaged in a storm. The other landed over 2.5 million men, 500,000 vehicles, and 4 million tons of supplies.

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MeyRW TIL about a book 'It Cant Happen Here' (1935). It's about "a demagogue who is elected President of the United States after fomenting fear and promising drastic economic and social reforms while promoting a return to patriotism and "traditional" values." A civil war breaks out as a result.
BrxQL TIL that in 1874, a book titled "Shadows from the Walls of Death" was published that warned about the use of poisonous arsenic dyes in wallpaper, and the book contained specimens of the wallpaper. The book was so toxic that all but four copies have been destroyed.
LkvP0 TIL that the first public listed company, the Dutch East India Company is also the most valuable company in history. at it's peak, it was worth what is now $7.9 trillion. for comparison, Apple is worth $1.3 trillion.
wJgY TIL that the white spots on finger nails are called Leukonychia, and are harmless and most commonly caused by minor injuries that occur while the nail is growing. Contrary to popular belief, leukonychia is not a sign of excess or deficiency of calcium and zinc or other vitamins in the diet
69lv8 TIL about Fat Club, men's organizations that were popular in the late 19th and early 20th century . The 1st rule of Fat Club was, you had to be at least 200 pounds to join.