There are many explanations for the technological decline of China at the end of the mediaeval period, and the coincident technological rise of Europe. One, in a word, is geography.
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Royal Derby Hosp, Dept Renal Med, Derby, England
Univ Nottingham, Sch Med, Div Med Sci & Grad Entry Med, Nottingham, EnglandRoyal Derby Hosp, Dept Renal Med, Derby, England