Prosthetic Immortalities examines the persistence of humans’ aspirations of deathlessness, showing that the link between immortalization and prostheticization is a ubiquitous element of the discourse of immortality. Arguing that the discovery of biological immortals, such as cancer cells and bacteria, present novel conceptual difficulties for traditional philosophical approaches to mortality and selfhood, Adam R. Rosenthal asks whether it is life itself that first births immortalizing prostheses.