Marie Curie was the first person to win two Nobel Prizes, and is one of only two people in the history of the Nobels to win in two different fields. She and her husband Pierre, along with Henri Becquerel, won the Physics Prize in 1903 for their discovery of radioactivity.
Curie discovered radium. It is one of the most radioactive and dangerous metals. She shared this discovery with Pierre Curie and Gustave Bemont. The three found radium in 1898. They discovered it when using a uranium ore. It gave off a lot of radiation. They decided that it was coming from more than uranium. The group found radium in the uranium. Radium is now used for many different things. For example, doctors used to use it to kill cancer cells. Radium was found in paint and watches.