Jellybean continues to defy expectations. The 5-year-old Labrador retriever mix jumps up and down from her favorite spot on the couch and walks around the living room with such ease, it’s as if she hadn’t ever had metastatic cancer. Her ...

Our bodies consist of about 30 trillion human cells, but they also host about 39 trillion microbial cells. These teeming communities of bacteria, viruses, protozoa, and fungi in our guts, in our mouths, on our skin, and elsewhere—collectively called the ...