A new survey of DNA fragments circulating in human blood suggests the bacteria and viruses living within us are vastly more diverse than previously known. In fact, more than 50% of that DNA has never been seen before. Kowarsky et al discovered that the human body contains a vast and unexpected diversity of microbes, many of which have highly divergent relationships to the known tree of life. Image credit: Arek Socha. “We found things that are related...
