Photos courtesy of Marina Von Neumann-Whitman.
Page 71. Stanislaw Ulam papers, American Philosophical Society.
Page 85. Courtesy of Los Alamos National Laboratory.
Page 106. The University of Pennsylvania archives.
Pages 131, 139. Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton.
Page 158. Theory of Games and Economic Behavior, John Von Neumann and Oskar Morgenstern, Princeton University Press.
Pages 194, 196. RAND Corporation.
Page 240. The Martin Gardner Literary Interests/Special Collection, Stanford University Library. Courtesy of Diana Conway.
Pages 249, 250, 251. Used with permission of Stephen Wolfram, LLC https://www.wolframscience.com/nks/<https://www.wolframscience.com/nks
Page 256. Nils Aall Barricelli, ‘Numerical Testing of Evolution Theories. Part I: Theoretical Introduction and Basic Tests’, Acta Biotheoretica, 16 (1962), pp. 69–98.
Page 277. Briscoe Center for American History.