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Marie Curie is best known as the discoverer of the radioactive elements polonium and radium and as the first person to win two Nobel prizes. For scientists and the public, her radium was a key to a basic change in our understanding of matter and energy.
In 1903, Marie Curie obtained her doctorate for a thesis on radioactive substances, and with her husband and Henri Becquerel she won the Nobel Prize for physics for the joint discovery of radioactivity. The financial aspect of this prize finally relieved the Curies of material hardship.