By Laura Rogers
Last year, my 12-year-old son came down with a skin infection. He was prescribed an antibiotic, took the full treatment, and got better. Of course there is nothing remarkable about this story these days — and that, in itself, is actually quite remarkable.
For thousands of years, humankind’s most lethal enemies were not saw-toothed predators but tiny microbes. Bears and wolves never halved the population of Europe, but a bacterial plague did.