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After the conquests of Genghis Khan, Iran's population could recover until the middle of the 20th century
Genghis Khan was the ruthless head of the Mongol Empire. And during the heyday of the state he founded and related conquests killed millions of people. In Persia, for example, as a result of his actions killed ten to fifteen million people, or about 75% of the population. Now in Persia is Iran.
The carnage was so large-scale that the population could not recover to pre-Mongol levels until the 1950s of the last century. Given the fact that Genghis Khan attacked Persia, around 1219, the year it took about 700 years.
via factroom.ru
Medieval spiral stairs "twisted" in a clockwise direction in order to put in an unfavorable position of the invader
US Department of Defense states that after 30 years of "People X» will become a reality