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Genghis Khan May Have Owed His Success to Good Weather

Genghis Khan and his Mongol horsemen raided and conquered much of the world some 800 years ago. Now, scientists are saying the rise of one of mankind’s greatest empires was aided by some nice weather. Research appearing in this week’s issue of the Proceedings of the National Academy of Sciences describes how ancient tree rings show that when the empire rose, its typically cold and arid homeland in central Asia was experiencing one of its mildest, wettest weather periods ever—leading to booming grass production that kept the invaders’ vast numbers of war horses and livestock fed.

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