The Other Factor

The Economist delves into the human microbiome and how it affects health.

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http://www.popsci.com/science

http://www.popsci.com/science/article/2011-09/fyi-how-much-bacteria-do-p...
"Enough to fill a big soup-can, that's 3 to 5 pounds."

There may be more bacterial cells, but they are tiny
so it's hardly a fair comparison.
It's like saying that elephants are mostly gnats because
there's only one elephant but dozens of gnats on it.

"difference bacterial

"difference bacterial flora"

should be "different"