Did the Great Wall of China work?

Imagine that you’re a member of the fearsome Mongol cavalry: Mounted on horseback, equipped with the era’s ultimate weapons technology and the skills to wield them with deadly effect. You’re part of one of the most devastating military forces of its time, seizing and burning cities, toppling empires. Now you’re galloping over the plains of…

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Mystery of the Roopkund skeleton lake

High in the Indian Himalayas, a four-to-five-day trek from the nearest village, sits an unassuming glacial lake called Roopkund. The spot is beautiful, a dollop of jewel-toned water amid rough gravel and scree, but hardly out of the ordinary for the rugged landscape — except for the hundreds of human bones scattered within and around…

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