In this concisely argued, short new book, well-known philosopher Naomi Zack explores the scientific and philosophical problems in applying a biological conception of race to human beings. Through the systematic analysis of up-to-date data and conclusions in population genetics, transmission genetics, and biological anthropology, Zack provides a comprehensive conceptual account of how "race" in the ordinary sense has no basis in science. Her book combats our everyday understanding of race as a scientifically supported taxonomy of human beings, and in conclusion challenges us to be clear about what we mean by "race" and what it would require to remedy racism.