Now hear this: once upon a time, a thoughtful doctor discovered that cholera was spread by filthy drinking water. This was usually lurking in contaminated wells.
At the time, the middle of the Victorian age, that deadly disease killed tens of thousands of people in this country. The clever doctor, whose name was John Snow, had long suspected that the disease could be spread through water.
In 1854, he showed by on-the-spot research that a severe outbreak of cholera in London’s Soho was directly linked to a particular pump. He chained up its handle. The epidemic faded away. Now here is the amazing
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