Marie Curie (1867–1934) was a Polish-French physicist and chemist. Born Maria Salomea Skłodowska in Warsaw, she studied at the clandestine Floating University and began her practical scientific training in the same city. In 1891, she followed her older sister to study in Paris, where she earned her higher degrees and conducted her subsequent scientific work, becoming the first female professor at the University of Paris (La Sorbonne). Her achievements included a theory of radioactivity (a term that she coined), techniques for isolating radioactive isotopes, and the discovery of two elements, polonium (which she named for her native country) and radium. Under her direction, the world's first studies were conducted into the treatment of neoplasms, using radioactive isotopes. She founded the Curie Institutes in Paris and in Warsaw, which remain major centres of medical research today. During World War I, she established the first military field radiological centres. She was the first woman to win a Nobel Prize (in Physics, shared with her husband, Pierre Curie, and with her doctoral advisor, Henri Becquerel, in 1903), the only woman to win it in two fields (the other being Chemistry, in 1911), and the only person to win in multiple sciences. Curie died in 1934 of aplastic anemia brought on by years of her exposure to radiation.