The Mystery of the Jade Discs

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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, , are among those who have studied the the article from National Geographic News:

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