Marie Skłodowska-Curie was a Polish-born French physicist and chemist who conducted pioneering research on radioactivity, a term she herself coined. Together with her husband Pierre Curie, she discovered the elements polonium and radium. She became the first woman to win a Nobel Prize, the first person to win the prize twice, and remains the only person to win Nobel Prizes in two different sciences (Physics in 1903 and Chemistry in 1911). During World War I, she also developed mobile X-ray units, known as “Petites Curies,” to help treat wounded soldiers.