20 November 2007 (ABC News in Science, Reuters) – A new study in the Proceedings of the National Academy of Sciences reveals the existence of an extensive interaction network involving Taiwanese jade (nephrite) as far back as 5,000 years ago. The jade artefacts turn up in Taiwan, Vietnam, Thailand, Malaysia and the Philippines (where it is known locally as lingling-o). Using a newly-developed process to analyse the jade, the study found that 116 out of the 144 artefacts came from the same source in Taiwan. The predominant source of jade in Taiwan, coupled with the distribution of the jade artefacts throughout Southeast Asia and their relative uniformity of the artefact types, leads to the conclusion that there must have been an extensive degree of interaction between different Southeast Asian populations, even across the sea. What’s left now is to uncover the technique used to create the jade artefacts. Experimental archaeology, anyone?