Curie did many things. She and her husband created a theory of "radioactivity" (a term made by her and her husband Pierre Curie). They found different ways to separate radioactive isotopes and discovered two new elements: radium and polonium. The term polonium was named after Poland, her home country. She used her own studies in radioactivity to develop a new treatment for cancer. These treatments used the radioactive isotopes. She was the first woman to win the Nobel Prize. She was the first person to win two Nobel Prizes.