I read an article on medicine that said until the advent of antibiotics, plumbers probably saved more lives that Doctors. This of cause was because of the improvements in sanitation and waste disposal. During the middle ages, sewage and garbage disposal in most cities was simple; you threw it out the window into the street. Of cause, this led to all kinds of health problems, which included the plagues that were spread by fleas which lived on the rats that ate the sewage and garbage.
In some parts of the world, sanitation is not much improved over what we had in the middle ages. …
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