Marie Curie l'industrie nationale" ). That same year Pierre Curie entered her life; it was their mutual interest in natural sciences that drew them together. Pierre Curie was an instructor at the School of Physics and Chemistry, the "École supérieure de physique et de chimie industrielles de la ville de Paris" (ESPCI). They were introduced by the Polish physicist, Professor Józef Wierusz-Kowalski, who had learned that she was looking for a larger laboratory space, something that Wierusz-Kowalski thought Pierre Curie had access to. Though Curie did not have a large laboratory, he was able to find some space for Skłodowska where she
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