Marie Curie theory of "radioactivity" (a term that she coined), techniques for isolating radioactive isotopes, and the discovery of two elements, polonium and radium. Under her direction, the world's first studies into the treatment of neoplasms were conducted 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 developed mobile radiography units to provide X-ray services to field hospitals. While a French citizen, Marie Skłodowska Curie, who used both surnames, never lost her sense of Polish identity. She taught her daughters the Polish language and took
Marie Curie of biographies are devoted to her. In 1938 her daughter, Ève Curie, published "Madame Curie". In 1987 Françoise Giroud wrote "Marie Curie: A Life". In 2005 Barbara Goldsmith wrote "Obsessive Genius: The Inner World of Marie Curie". In 2011 Lauren Redniss published "Radioactive: Marie and Pierre Curie, a Tale of Love and Fallout". Greer Garson and Walter Pidgeon starred in the 1943 U.S. Oscar-nominated film, "Madame Curie", based on her life. More recently, in 1997, a French film about Pierre and Marie Curie was released, "Les Palmes de M. Schutz". It was adapted from a play of the same name.