Then in the Middle Ages the spread of plague made people consider more closely their attitude to hygiene and what they might do to modify their own susceptibility to outbreaks. Unfortunately, people everywhere came to exactly the wrong conclusion. All the best minds agreed that bathing opened the epidermal pores and encouraged deathly vapors to invade the body. The best policy was to plug the pores with dirt. For the next six hundred years most people didn’t wash, or even get wet, if they could help it—and in consequence they paid an uncomfortable price. Infections became part of everyday
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