11-18-2004, 09:44 PM
actualy they were introduced after we poluted our water ways as a method of cleaning the toxins of the bottom of the rivers and lakes....
our water way were full of colera and other human waist to the point where you would become ill from breathing the fumes of the lakes and rivers.
we had vary little knolage of sanitation back then, tho we have it now we do a lot better than we did back then but still not enough...
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our water way were full of colera and other human waist to the point where you would become ill from breathing the fumes of the lakes and rivers.
we had vary little knolage of sanitation back then, tho we have it now we do a lot better than we did back then but still not enough...
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