Alan P. Lightman is professor of the practice of the humanities at the Massachusetts Institute of Technology. His books include Screening Room and Einstein’s Dreams. William H. Press is the Warren J. and Viola M. Raymer Professor in Computer Science and in Integrative Biology at the University of Texas, Austin. Richard H. Price is senior lecturer in physics at the Massachusetts Institute of Technology. He is the coeditor of Black Holes. Saul A. Teukolsky is the Hans A. Bethe Professor of Physics and Astrophysics at Cornell University and the coauthor of Black Holes, White Dwarfs and Neutron Stars. Press and Teukolsky are coauthors in the Numerical Recipes book series.