In Lousy Sex Gerald Callahan explores the science of self, illustrating the immune system's role in forming individual identity. Blending the scientific essay with deeply personal narratives, these poignant and enlightening stories use microbiology and immunology to explore a new way to answer the question, who am I? "Self" has many definitions. Science has demonstrated that 90 percent of the cells in our bodies are bacteria--we are in many respects...