One glimpse of the corpses was enough to shock Victor Mair profoundly. In 1987, Mair, a professor of Chinese at the University of Pennsylvania, was leading a tour group through a museum in the Chinese city of Ürümqi, in the central Asian province of Xinjiang, when he accidentally strayed into a gloomy, newly opened room. There, under glass, lay the recently discovered corpses of a family--a man, a woman, and a child of two or three--each clad in long, dark purple woolen garments and felt boots. "Even today I get chills thinking about that first encounter," says Mair. "The Chinese said they were 3,000 years old, yet the bodies looked as if they were buried yesterday."
But the real shock came when Mair looked closely at their faces. In contrast to most central Asian peoples, these corpses had obvious Caucasian, or European, features--blond hair, long noses, deep-set eyes, and long ...