The Mystery of the Jade Discs

Jade bi (discs), from China, that resemble modern-day CD's or donuts, and date to the late Neolithic Period, Liangzhu culture (ca. 3300-2250 BC) remain a mystery.

Researchers at the Smithsonian's Freer and Sackler galleries in Washington, D.C., are among those who have studied the bi.