We live in the era of a real revolution in microbiology. The latest technologies have allowed scientists to immerse themselves in the world of microscopic creatures that inhabit our bodies and make amazing discoveries in this world. It turns out that microbes, which live in incredible quantities in almost every corner of our body, play a much more important role than we previously thought: not only our physical health depends on them, they determine our mood, our tastes and our very personality. We learn about these scientific breakthroughs first-hand: the author of the book, Rob Knight, is one of the leading modern microbiologists who is creating the science of the future before our eyes.