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Got a feeling you’re not alone? Forget alien life forms—we’re talking an altogether different kind of critter: the trillions of microbes that call your body home. The majority of these tiny creatures live in your gastrointestinal tract. But how did they get there? What do they do? What happens when they get out of whack? And what can we do about it? Welcome to the alien world of bacteria. Image source: ZEISS Microscopy / Flickr. Meet your microbiome WHAT ARE MICROBES? Trillions of tiny organisms—microbes—are all over, and inside, each of our bodies. They’re on our skin and genitals, and in...