Why is the sky blue?

It is a well-known (but still fun) fact that the amount of microorganisms in your body outnumbers your own cells 10 to 1. Hundreds of trillions of microbes live within one human body – many crucial to the body’s health and physiological function. Until just recently microbes seemed to get the shafted by biologists, many of who were only interested in the host organism, you or me for example, but largely ignored the influences of our passenger-partners (excepting the virulent or dangerous ones, of course).

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