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The circulation of blood

 
   
 
In the late 1600s, when microscopes were new, Dutch lens maker Antoni van Leeuwenhoek scraped some plaque off his own teeth and looked at it through a microscope. Gasp! It was crawling with "animalcules." He discovered that tiny creatures invisible to the naked eye abounded everywhere. Less than two centuries later, knowledge of this invisible universe enabled Louis Pasteur to construct his "germ theory of disease" which in turn enabled doctors to conquer a whole host of diseases: typhoid, typhus, polio, diphtheria, tetanus, smallpox tuberculosis--the list goes on.

 
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