CARL ZIMMER, guest editor, writes the Origins column for the New York Times. He is the author of fourteen books, including Life's Edge and She Has Her Mother's Laugh, both of which were finalists for the PEN/E.O. Wilson Literary Science Writing Award. Zimmer has written for magazines including The Atlantic, National Geographic, Time, and Scientific American. He has won the American Association for the Advancement of Science's Science Journalism Award three times, and is a two-time winner of the National Academies Communication Award. Zimmer is professor adjunct at Yale University