Historians had come along much later and developed their own vocabulary for telling the story of the succeeding five thousand years. The first pregnancies were called Gestations. Not counting the numerous miscarriages, there had been thirty-nine of them, distributed among the Seven Eves, before Camila, the last to stop bearing children, had finally gone through menopause. From these, thirty-five viable girls had resulted. Thirty-two had gone on to have children of their own. By then, Eve Moira had figured out how to synthesize Y chromosomes, and so some of the second generation had been male. The result, therefore, had been thirty-two Strains. Each of the seven new races had embodied more than one Strain. The Strains were recognizably different and yet clearly classifiable as belonging to one race or another, somewhat as East Africans differed from West Africans but still looked like Africans to Europeans.