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"When long-distance travel is rare, epidemics spread like a slow, rippling wave, as demonstrated by the simulation (left) and the actual historical spread of the black death during the Middle Ages.
Credit: Images courtesy of Oskar Hallatschek and D. Sherman and J. Salisbury"
Graphic source: http://www.sciencedaily.com/releases/2014/11/141105093508.htm
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Very comprehensive coverage 