L I S T O F I L L U S T R A T I O N S x x x v i i 19. Einstein in his Berlin apartment, ca. 1927. (Courtesy ullstein bild, Granger, NYC, All Rights Reserved, NY) 20. Leo Szilard’s faculty identity card from the Friedrich Wilhelm University, Berlin, ca. 1927. (Courtesy University of California San Diego, Special Collections and Archives, Leo Szilard Papers) 21. Erwin Schrödinger. (Photo by Francis Simon, courtesy American Institute of Physics, Emilio Segrè Visual Archives) 22. Werner Heisenberg, 1927. (Courtesy American Institute of Physics, Emilio Segrè Visual Archives, Segrè Collection) 23. Copley Medal of the Royal Society, awarded to Einstein on 30 November 1925. (Photograph captured by Ardon Bar-Hama, Ra'anana, Israel. Courtesy The Albert Einstein Archives, Hebrew University of Jerusalem) 24. Paul Ehrenfest and Pascual Jordan, 1927. (Courtesy American Institute of Physics, Emilio Segrè Visual Archives, Segrè Collection) 25. Einstein and Wolfgang Pauli in Paul Ehrenfest’s home, Leyden, September– October 1926. (Photo by Paul Ehrenfest, courtesy CERN, Switzerland) 26. Emil Rupp ca. 1934. (Courtesy of the Niedersächsische Staats– und Universitätsbibliothek Göttingen) 27. Hans Reichenbach, Berlin ca. 1928. (Courtesy Hans Reichenbach Papers, University of Pittsburgh Library, Archives and Special Collections) 28. Arthur H. Compton and Auguste Piccard, University of Chicago, probably 1933. (Courtesy Getty Images) 29. George Yuri. Rainich, Ann Arbor, Michigan, ca. 1926. (Photo University of Michigan Alumni Association, courtesy Bentley Historical Library, University of Michigan) 30. Dayton C. Miller, 1921. (Courtesy Dayton C. Miller Collection, Music Division, Library of Congress)