Machines Like Us – Science News

Evolutionary biologist Paul Ewald drags us into the sewer to discuss germs. Why are some more harmful than others? How could we make the harmful ones benign? Searching for answers, he examines a disgusting, fascinating case: diarrhea.

Paul Ewald has a problem with modern medicine: It ignores the fact that many diseases of unknown origin can be linked to slow-growing infections caused by viruses, bacteria and other microorganisms.