During WW II, staying in Brazil, then a country hostile to Italy, he became an authorized alpine guide in the Parque Nacional do Itatiaia, where there is a peak named "Pico Occhialini".
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In 1932, he collaborated in the discovery of the positron in cosmic rays at the Cavendish Laboratory of Cambridge, under the leadership of Patrick Blackett, using cloud chambers.
Giuseppe Garibaldi | Giuseppe Tornatore | Giuseppe Sinopoli | Giuseppe De Santis | Giuseppe Capogrossi | Giuseppe Terragni | Giuseppe Mazzini | Giuseppe Ungaretti | Giuseppe Lignano | Giuseppe Tucci | Giuseppe Radaelli | Giuseppe Pizzardo | Giuseppe Morello | Giuseppe Marchese | Giuseppe Guarneri | Giuseppe Di Cristina | San Giuseppe Jato | Rima San Giuseppe | Giuseppe Valdengo | Giuseppe Tomasi di Lampedusa | Giuseppe Soleri | Giuseppe Sergi | Giuseppe Quaglio | Giuseppe Piazzi | Giuseppe Patroni Griffi | Giuseppe Parini | Giuseppe Mosca | Giuseppe Greco | Giuseppe Giusti | Giuseppe Farina |