accomplishment for his intelligent and ambitious siblings. His success as a physicist brought invitations from top universities around the world, including the United States, which he would visit, paving the way for Dietrich a few years hence. And in 1923 Dietrich would leave home, although no one in this close-knit family ever really left. Within a few years, Christel and her husband would move in across the street; and in the thirties, Ursula and Rüdiger would move next door to her parents in Charlottenburg,