Many newborn and toddler stars are not all that different from newborn and toddler humans—prone to bouts of cranky energy, loud and violent tempers, and indiscriminately wailing and vomiting heaps of ...

As John Mayer tells us (and tells us, and tells us), your body is a wonderland. When it comes to microbial life, this holds especially true for your gut. There, hundreds of residential species eat, br...