If I told you there's a new kind of medicine that could heal you, but it was made from germs, would you take it? If you’re open to the idea – or maybe because it sounds gross – then hang with me and let’s start here. We see germs as a threat, and we've gotten really good at killing the ones that cause infections with things like hand sanitizers and antibiotics. In fact, since 1950 the rate of infectious diseases, like measles, mumps and TB has plummeted. But during that same time, chronic diseases, including asthma, diabetes and Crohn’s disease...