text: How infectious disease may have shaped Human origins - The Archaeology News Network F
  6/06/2012 03:30:00 PM
  Escherichia coli bacteria, like these in a false-color scanning electron micrograph by Thomas Deerinck at UC San Diego's National Center for Microscopy and Imaging Research, cause a variety of often life-threatening conditions, particularly among the young. Varki and colleagues suggest a genetic change 100,000 or so years ago conferred improved protection from these microbes, and likely altered human evolutionary development [Credit: University of California, San Diego Health Sciences]