The first half of Control is the history of an idea, from its roots in key philosophical texts of the classical world all the way into their genocidal enactment in the twentieth century. The second part of the book explores how eugenics operates today, as part of our language and culture, as part of current political and racial discussions, and as an eternal temptation to powerful people who wish to improve society through reproductive control. With disarming wit and scientific precision, Rutherford explains why eugenics still figures prominently in the twenty-first century, despite its genocidal past. And he confronts insidious recurring questions- did eugenics work in Nazi Germany? And could it work today?-revealing the intellectual bankruptcy of the idea, and the scientific impossibility of its realization.