Marie Curie remains the only person to win Nobel Prizes in two different sciences — Physics in 1903, shared for research into radiation, and Chemistry in 1911 for isolating the elements polonium and radium.
Working with painstaking chemistry, she and her collaborators showed that certain elements spontaneously emit energy from within their atoms — a property she named radioactivity. The discovery overturned the idea of the atom as indivisible and unchanging, opening the door to modern nuclear physics.
Her methods for measuring and separating radioactive materials also laid groundwork for later medical uses, including cancer treatment.
Why it matters: Curie's work revealed that atoms have an inner life — energy locked inside matter itself — reshaping both physics and medicine.
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