Plague may have helped end Roman Empire

By Charles ChoiLiveSciencePlague may have helped finish off the Roman Empire, researchers now reveal.Plague is a fatal disease so infamous that it has become synonymous with any dangerous, widespread contagion. It was linked to one of the first known examples of biological warfare, when Mongols catapulted plague victims into cities.The bacterium that causes plague, Yersinia pestis, has been linked...    

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