Invisible to the naked eye, trillions of microbes are in, on, and around your body. By the numbers, there are actually about as many bacteria on you as you have human cells. Microbiologists are rightfully fascinated by these populations, termed your microbiome, and what impact they have on their human hosts. Studies correlating bacterial species A to human trait Z are frequent, but their reach tends to be more affected by the clickability of the headline than the soundness of their science.
