> It's a biography of Galileo supplemented with letters he exchanged with his daughter, who was a Catholic nun. Note: he had two daughters, both nuns. (Which w

> It's a biography of Galileo supplemented with letters he exchanged with his daughter, who was a Catholic nun. Note: he had two daughters, both nuns. (Which was really the only option for unmarried women at the time.) It's just that the letters were only with one of them.