We are vastly, ridiculously, hopelessly, humblingly outnumbered: For every one human cell, there are an estimated 10 single-cell microbes in us or on us, at least 100 trillion in all, nestled in our guts and in our urogenital tracts, lying on our skin and happily ensconced in our mouths and noses—entire civilizations of fungi and protozoa and (mostly) bacteria that eat and breathe, evolve and reproduce and die.
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