Marie Curie in about 1920Marie Curie (1867–1934) was a scientist at a time when it was unusual for a woman to be a scientist at all. She is remembered today for her work with her husband Pierre Curie on radioactivity. They discovered two radioactive elements: radium and polonium. She also played an important part in developing the use of X-rays, especially during World War I. She was the first woman to win a Nobel prize. She was also the only woman to have won a Nobel Prize in two different fields: physics and chemistry.