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TIL at the Battle of Missionary Ridge, an 18-year old Union lieutenant, Arthur MacArthur, took his regimental flag and led the charge to the summit, an act for which he received the Medal of Honor. His son was Douglas MacArthur, the general in charge of the Pacific theater during WWII.

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5YkAD TIL This tower in Yorkshire is the tallest folly in the world. It was erected by John Edward Wainhouse and was originally going to be a mill chimney but was converted into a viewing platform to look over a private garden because of a neighbour's feud.
wo0P1 TIL that most tap water when left out for a day will increase in pH approx. 1 unit (turns more basic) as dissolved CO2 degasses
4X71b TIL there are 17 monarchies in the world ruled by a Queen, 16 of those are Queen Elizabeth II
gMYKA TIL one of the great results of the 'Cassini' mission was the finding that the beautiful Saturn rings are a transient structure. In about a hundred million years, the ring will disappear, leaving behind a depleted version of Jupiter with less shimmering colors.
NXYeE TIL that 20%-40% of the population do not carry the gene that would allow them to smell cyanide.