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TIL that in Georgia (the country) there are mountain passes that have been used by invading armies so many times that the farm houses have fortified towers.

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ROa1 TIL Stone castles were very, very effective against the Mongols. They sustained heavy casualties trying, but were never able to take a single one in two invasions of Hungary.
R4m4 TIL the Eiffel Tower requires 60 to 70 tonnes of paint to cover the entire structure. The tower is also painted a lighter shade at the bottom and a darker shade near the top to counteract the effect of atmospheric perspective.
e0PD4 TIL that cousins whose parents are identical twins share 25 percent of their DNA, instead of the normal 12.5 percent. While siblings share 50 percent of their DNA, half-siblings share 25 percent. That's why, though children of identical twins are legally cousins, they are genetically half-siblings
J16Kk TIL that during the Victorian period, because of fires, the average lifespan of a theater was under 20 years.
a8VVJ TIL that a famine in Persia (Iran) between 1917–1919 lead to the deaths of an estimated 2 million people. It's an event that hasn't been studied by many historians.