Pierre and Marie Curie were pioneering scientists known for their groundbreaking work in the field of radioactivity. Born in France, they conducted extensive research on radioactive elements, particularly uranium and radium. Their collaboration led to the discovery of these elements' properties and the term "radioactivity," which describes the emission of radiation from unstable atomic nuclei. Marie Curie was the first woman to win a Nobel Prize, and she remains the only person to have won Nobel Prizes in two different scientific fields: Physics and Chemistry. Pierre Curie also received the Nobel Prize in Physics for his contributions to the understanding of radioactivity. Their work laid the foundation for advancements in nuclear physics and medical treatments.