The still-mysterious ecosystem of bacteria living inside you determines an incredible amount about your health - and your personality. Numbering anywhere from 30 trillion to 100s of trillions, there are more microorganisms in your body than there are stars in the Milky Way.
Today, they're often compared to an extra 'organ,' since together they weigh three pounds and seem to perform countless functions in our body, from helping our digestion to affecting our mood, of which researchers are only just now starting to grasp the scope.
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