At any given moment, you have somewhere between 10 trillion and 100 trillion microorganisms inhabiting your gut — that’s more microbes in your bowels than there are cells in your body. If that isn’t impressive enough, consider that collectively these microbes have about 150 times as many genes as your own genome

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“Even though you don’t think of gut bacteria being all over you, they kind of are,” said Andrew Moeller, an evolutionary biologist at the University of California, Berkeley and co-author of the paper

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Neuroscientists are probing the idea that intestinal microbiota might influence brain development and behaviour. Peter Andrey Smith

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The rich array of microbiota in our intestines can tell us more than you might think

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