Intelligent Evolution

From Bill Bryson’s brilliant book, At Home: A Short History of Private Life:

“Move down to the next level of living things, to the world of microbes, and the numbers swell beyond counting.  Your skin alone is home to about a trillion bacteria.  Inside you are many thousands of trillions more, many of them engaged in necessary and helpful tasks like breaking down food in the gut.  Altogether you hold about a hundred quadrillion bacterial cells in your body.  If you took them out and put them in a pile, they would weigh about four pounds.”

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