These two men were as different as can be. Fatou was no longer very young. He was a very strange man who did not want to have a career as such because he never wanted to leave Paris. He was a solitary person, as I understand it, and he became a calculator at the observatory. He had a position in the daytime doing calculations with slide rules of tables or logarithms, of trajectories of planets, and at night and on weekends was doing mathematics. This double life was very strange. He was very much the black sheep in the French mathematical community. Besides, he was physically very weak; I thought he had a foot much longer than the other. Anyhow, he was not called to war because he was just not good as a soldier. So he was in Paris. Who was Julia? Julia was a very up and coming person, actually from Oran, Algeria, of a Spanish family originally, who was the greatest discovery of French mathematics at the time. He had been sent to the front in 1914 or 1915 and deeply wounded. He came back alive, which is quite extraordinary, but for many, many months he had operations performed on him to remove shrapnel, and on his face they were doing that without anaesthesia because they were afraid of killing him. So he was being tortured, in a certain sense, for his own good. At the same time he started doing mathematics.