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The application of recent scientific techniques to the study of disease in history is fascinating and enlightening. A larger socio-political context is also useful. While I emphasize that the new research is useful and thought-provoking, we should also be mindful of one word in the titles of both scientific articles cited, namely "linked". As scientists of all stripes, including social scientists, know, correlation is not causation.
Teachers of World History might appreciate a little more background to the piece that appeared in Nature News (http://www.nature.com/news/collapse-of-aztec-society-linked-to-catastrophic-salmonella-out...).