Photo Credits

President Woodrow Wilson. Library of Congress. Prints and Photographs Division.

Wendell Willkie. Presidential Campaign Poster of 1940 which is in the public domain.

President Franklin D. Roosevelt. Franklin D. Roosevelt Presidential Library and Museum

H. G. Wells. Wikimedia Commons (public domain).

Norman Cousins. PD-USGOV-NASA

Arnold Toynbee. Wikimedia Commons (public domain)

President John F. Kennedy Portrait distributed by the White House. Image courtesy of the John F. Kennedy Presidential Library and Museum.

Albert Einstein. Library of Congress Prints and Photographs Division. Digital ID eph. 3b46036

Edward Teller. Lawrence Livermore National Laboratory Photo.

Eleanor Roosevelt. Franklin D. Roosevelt Presidential Library and Museum.

President Harry S. Truman. U.S. Army Film. Courtesy of the Harry S. Truman Library

President Dwight D. Eisenhower. Courtesy of the Dwight D. Eisenhower Presidential Library.

Chief Justice Earl Warren. Harris and Ewing Photography from which works have all lapsed into the public domain.

President John F. Kennedy.. John F. Kennedy Presidential Library and Museum. Photo no. Kn24677

President Jimmy Carter. Official White House Photograph. Library of Congress, No 31JA770324

President George H. W. Bush. Official White House Photo. Library of Congress Prints and Photographs Division.

Walter Cronkite. Steve Freidman Copyright CBS Inc. All rights reserved. (#86005). Used with permission.