Drawing on archival materials of twentieth-century biology; little-known works of fiction and science fiction; and twentieth- and twenty-first century U.S. and U.K. government reports by the National Institutes of Health, the Parliamentary Advisory Group on the Ethics of Xenotransplantation, and the President’s Council on Bioethics, she examines a number of biomedical changes as each was portrayed by scientists, social scientists, and authors of fiction and poetry. Among the scientific developments she considers are the cultured cell, the hybrid embryo, the engineered intrauterine fetus, the child treated with human growth hormone, the process of organ transplantation, and the elderly person rejuvenated by hormone replacement therapy or other artificial means. Squier shows that in the midst of new phenomena such as these, literature helps us imagine new ways of living. It allows us to reflect on the possibilities and perils of our liminal lives.