According to the nineteenth-century teachings of Nikolai Fedorov--librarian, religious philosopher, and progenitor of Russian cosmism--our ethical obligation to use reason and knowledge to care for the sick extends to curing the dead of their terminal status. The dead must be brought back to life using means of advanced technology--resurrected not as souls in heaven, but in material form, in this world, with all their memories and knowledge. Fedorov's...