In 1910, when she was only 43 years old and she was at the height of her fame and a widow for four years, Marie Curie began a passionate affair with her friend and colleague, the physicist Paul Langevin. Professor at the Collège de France, immense scientist, friend and competitor of Einstein in the research on relativity, he is five years younger than her. They have known each other for a very long time since Paul was a pupil of Pierre Curie. Problem: Langevin is married with four children. In November 1911, the press unveiled this affair and the scandal was enormous.