The plague has not been eradicated, and recent research offers a clue regarding the origins of this civilization-killing pathogen—the bacterium Yersinia pestis. Capable of defeating armies, toppling empires, collapsing civilizations, and ushering in dark eras like the Middle Ages, it altered the course of history; without it, human evolution would surely have been much more rapid—and, of course, there would be more of us (in terms of sheer numbers, not necessarily human compassion).
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