In March 1934 Fermi succeeds in a feat considered impossible. Using simple but ingenious equipment, he discovers that some substances, irradiated with neutrons, acquire beta-type radioactive properties. Later, in October of the same year, he discovers that the slowing down of neutrons, through layers of paraffin or water, whose molecules are rich in hydrogen, can enormously increase their ability to induce radioactivity. This discovery will have an exceptional scientific and technological impact.
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