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What do you think ? 

According to New Scientist, this was thoroughly examined by bacteriologist Theodor Rosebury. The answer is... astonishing.

In the mouth alone, there are some 80 species on the microscopic level. The total number of species is estimated to be somewhere above 200. This include lice, tapeworms, bacteria and whathaveyou. When it comes to numbers, he estimated that some 10 million individual bacteria inhabit each square centimeter of the human body. (A human body is roughly 2 square meters of skin. I have no desire to know how this was calculated) The inside surfaces of your body (go figure) can contain thousand fold this number. The interesting thing is that when it comes to genes, the organisms living on us together, have four times the genetic mass than we do ourselves. 

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