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
École élémentaire Marie-Curie 1990s the then principal, Jean-Claude Imbeault, made a number of changes to the school. He changed the school colours from blue and white, to black, silver and white; had the school renamed to "École élémentaire Marie-Curie"; gave it a new logo and a motto "Savoir faire et bien faire"; and, most significantly, created a plan for a multicultural school population. London has a very small francophone population; however, it qualifies for French language services under the French Language Services Act, and also qualifies to have French schools. While this was the first French language elementary school in London, there are