The first world war and its impact, 1914-1921 -- Science meets politics : the relativity revolution, 1918-1923 -- Anti-semitism and Zionism, 1919-1930 -- Internationalism and European security, 1922-1932 -- Articles of faith, 1930-1933 -- Hitler's Germany and the threat to European Jewry, 1933-1938 -- The fate of the Jews, 1939-1949 -- The Second World War, nuclear weapons, and world peace, 1939-1950 -- Soviet Russia, political economy, and socialism, 1918-1952 -- Political freedom and the threat of nuclear war, 1931-1955.