What Yang and her friends are doing, in fact, is piecing together the 2,200-year-old mystery of the terra-cotta army, part of the celebrated (and still dimly understood) burial complex of China ...

who died in 210 B.C. What else do you know about the Terracotta Army, which the Chinese often call the "eighth wonder of the world"? Time to marshal your knowledge of dynastic China and take our quiz!