A comparative investigation of Afro-Cuban ritual and Western science that aims to challenge the rationality of Western expert practices. Inspired by the exercises of Father Lafitau, an eighteenth-century Jesuit priest and protoethnographer who compared the lives of the Iroquois to those of the ancient Greeks, Stephan Palmi embarks on a series of unusual comparative investigations of Afro-Cuban ritual and Western science. What do organ transplants have to do with ngangas, a complex assemblage of mineral, animal, and vegetal materials, including human remains, that serve as the embodiment of the spirits of the dead? How do genomics and "e;ancestry projects"e; converge with divination and oracular systems? What does it mean that Black Cubans in the United States took advantage of Edisonian technology to project the disembodied voice of a mystical entity named ecu onto the streets of Philadelphia? Can we consider Afro-Cuban spirit possession as a form of historical knowledge production? By writing about Afro-Cuban ritual in relation to Western scientific practice, and vice versa, Palmi hopes to challenge the rationality of Western expert practices, revealing the logic that brings together enchantment and experiment.