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Can we domesticate germs? Paul Ewald on TED.com

Evolutionary biologist Paul Ewald drags us into the sewer to discuss germs. Why are some germs more harmful than others? How could we make the harmful ones benign? Searching for answers, he examines a disgusting, fascinating case: diarrhea. (Recorded February 2007 in Monterey, California. Duration: 17:52.)

Watch Paul Ewald’s talk on TED.com, where you can download it, rate it, comment on it and find other talks and performances.

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