Sounds like a pretty big deal, so why have I never heard about this before?
The concept and the name are quite new. It really started to be talked about in 2012, when the Human Microbiome Project was completed. Using the new technique of genetic sequencing, the aim of this program was to get a map of all bacteria living on humans. The results are amazing: it is literally a whole new world right under our noses (and ON your nose, and IN your nose…).