Bacteria and Chocolate Buttermilk Shakes
Once again, it was on day four or five of mapping out microorganisms on a giant flowchart that I was struck by an idea that zoomed me out to the scale of human history. On our bodies live bacteria and viruses that we refer to as “normal flora” and with whom we happily coexist. In an oversimplified model, when humans interact with a new organism for the first time, either our immune systems kill it, …