During the Cold War, both the U.S. and the U.S.S.R. stockpiled weapons, eventually holding enough power to destroy the world several times over. Yet neither side actually used these weapons. Learn more about M.A.D. in our article on HowStuffWorks.
Genghis Khan has more death attributed to him than any other person in history. Learn about Genghis Kahn and the siege Genghis Khan conducted on Nishapur.
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