"Polish physicist and chemist Marie Curie had a magnificent career. She won two Nobel prizes in 1903 and 1911 and became the first female professor at the University of Paris. Along with her husband, Pierre Curie, Marie discovered two new elements--polonium and radium. Sources speculate that such a pair of talented scientists must belong to the Ekaterina branch. If so, they clearly used their brilliant minds to track down the 39 Clues. Now, if only someone could discover what they were really researching...."