The Mystery of the Jade Discs | National Geographic

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.
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Read the article from National Geographic News:
http://news.nationalgeographic.....com/news/2013/09/13

The Mystery of the Jade Discs | National Geographic
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