Karl Matlin is professor in the Department of Surgery and a member of the Committee on Conceptual and Historical Studies of Science at the University of Chicago. Jane Maienschein is university professor in the School of Life Sciences at Arizona State University and fellow and director of the History and Philosophy of Science Project at the Marine Biological Laboratory in Woods Hole, Massachusetts. She is the author of Embryos under the Microscope: The Diverging Meanings of Life. Manfred Laubichler is president's professor in the School of Life Sciences at Arizona State University. Most recently, he is coeditor with Maienschein of Form and Function in Developmental Evolution.