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(Photograph) - Chinese puzzle: Nathan Sivin, professor of Chinese culture and history of science at the 51¹ú²úÊÓƵ of Pennsylvania, and Bridie Andrews, a postgraduate at the Wellcome Unit for the history of medicine at Cambridge 51¹ú²úÊÓƵ, review the East 51¹ú²úÊÓƵn collection in the Royal Museum of Scotland during the British Association of Chinese Studies annual conference, at the Edinburgh International Science Festival.