Marie curie discovered radium and polonium. Her discoveries helped us primarily when getting X-ray.
She is also known as madam curie.
Discovery of radium helped Ernest Rutherford in postulating structure of Atom. Radioactivity contradicted law of energy conservation which forced to formulate foundation of Physics. Her contributions matters in shaping the physical sciences in 20th and 21st century.
Curie majorly Researched radioactive substances.
Curie was first person to get Nobel Prizes twice.
Curie is only person to get two Nobel Prizes in Sciences. She got the Nobel in Physics and Chemistry for her contributions in Sciences.