Human Cells Make Up Only Half Our Bodies. A New Book Explains Why.
Lukas W
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I CONTAIN MULTITUDES The Microbes Within Us and a Grander View of Life By Ed YongIllustrated. 355 pp. Ecco/HarperCollins Publishers. $27.99. Reader, as you read these words, trillions of microbes and quadrillions of viruses are multiplying on your face, your hands and down there in the darkness of your gut.

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