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The Dancing Plague In July 1518, residents of the city of Strasbourg (then part of the Holy Roman Empire) were struck by a sudden and seemingly uncontrollable urge to dance. The hysteria kicked off when a woman known as Frau Troffea stepped into the street and began to silently twist, twirl and shake. She kept up her solo dance-a-thon for nearly a week, and before long, some three-dozen other Strasbourgeois had joined in. By August, the dancing epidemic had claimed as many as 400 victims. With no other explanation for the phenomenon, local physicians blamed it on “hot blood” and suggested the afflicted simply gyrate the fever away. A stage was constructed and professional dancers were brought in. The town even hired a band to provide backing music, but it wasn’t long before the marathon started to take its toll. Many dancers collapsed from sheer exhaustion. Some even died from strokes and heart attacks. The strange episode didn’t end until September, when the dancers were whisked away ...