Occhialini Scientific Life.- The Arcetri School of Physics.- Giuseppe Occhialini and the history of cosmic-ray physics in the 1930s: From Florence to Cambridge.- Occhialini's trajectory in Latin America.- Occhialini's scientific production between the two English periods.- Occhialini's contribution to the discovery of the pion. An interview by L. Gariboldi.- Occhialini and the Universit Libre de Bruxelles. An interview by L. Gariboldi.- Elementary-particle...