This year, scientists have made groundbreaking discoveries regarding the bacteria and fungus biome of our bodies. It may be difficult to believe, but the microbes living on and in your body outnumber your own cells 10 to 1. Not all bugs are bad, of course. As babies, gentle microbes strengthen our immune systems to fight off the nastier bugs that make us sick. Probiotics form colonies in the gut so that harmless bacteria takes up all the real estate that bad bacteria may otherwise nab. It turns out, the colonies of microbes thriving on us is diverse — and as unique as our fingerprints.