The history of racial hygiene/eugenics in Germany is much more than just the history of a science. It is a segment of the comprehensive rationalization process that affects the central area of human society, namely reproduction and the values and institutions that guide it. Moreover, it is the history of the genesis of the sciences responsible for this and their development from utopian social technologies to effective medical techniques. Finally, it is the story of the intertwining of scientific development, political ideologies, and societal values.