I was just thinking the other day about how we like to think of ourselves as humans, but we are infact mere living structures for colonies of microbes ;). Apartment complexes with central heating, and food delivery. InfoGraphic OK, there is some basic human structure dependent on DNA passed along from our ancestors, but there is also (by weight) an astonishing percentage of cell sized travelers on our skin, in our bellies, etc...I've read it can be 10% of body weight, and that in terms of cell numbers, there are actually 10x more bacteria than human cells. That means 90% of the cells you are walking around with all the time are not coding proteins from your DNA, but rather microbial proteins. It is not easy to count all these organisms I imagine, so who knows how much is enough/too little/too much. At the same time, if for one reason or another one of the bacterial groups gains an upperhand, then we end up with systemic problems... This seems to happen following a course o...