Current Issue:
June 17, 2004
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June 17, 2004
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Groovy technology
Graduate student Peter J. Lu found that distinctive spiral grooves carved on ornamental jade rings used in Chinese burial rites some 2,500 years ago appear to have been created with a highly precise machine. (Staff photos Rose Lincoln/Harvard News Office) Full story
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Harvard student identifies 2,500-year-old machine used to etch jade
Chinese device is oldest known to combine two types of motion
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