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The 1935 Nobel Laureates at the Nobel Prize Award Ceremony in the Golden Hall of the Stockholm City Hall, 10 December 1935. From left: James Chadwick, Irène Joliot-Curie, Frédéric Joliot and Hans Spemann.
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Frédéric Joliot and Irène Joliot-Curie in their physics laboratory at the Radium Institute in France, 1934. At this time they were working on the projection of nuclei, which was an essential step in the discovery of the neutron.