> we can't live without some "parasites" - see gut bacteria You made me curious to know if we would literally die without gut bacteria. The answer is no: "hum

> we can't live without some "parasites" - see gut bacteria You made me curious to know if we would literally die without gut bacteria. The answer is no: "humans can live without gut flora"[1]. [1] http://www.sciencedirect.com/science/article/pii/S0165247805000052 http://www.sciencedirect.com/science/article/pii/S0165247805... (Note: no criticism is intended. I understand the larger point you're making.)