Photo: Jade Earrings Reveal Ancient S.E. Asian Trade Route

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Similar "lingling-o" earrings found in Vietnam (left) and the Philippines (both right) are made of a distinctive type of jade from a single site in Taiwan, a new study shows.

The presence of this jade at ancient burial sites across Southeast Asia suggests that the region had one of the largest marine trading networks of prehistoric times.

Photograph courtesy PNAS/National Academy of Sciences © 2007

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