An excellent definition of race and its various connotations and meanings this should be read by every teen ager, with a general science Freshman High School grounding, especially those whose thinking in this direction is confused or uncertain. Beginning with our superstitions, the authors talk first about some of the things which are untrue about races. Logically, they explain the natural if mistaken propensity to consider one's own group as superior and the difference between this and scientific proof. Moving then to concrete examples there are full discussions of external and internal differences between individuals and groups and how we can, to a certain extent, type them. Genetic characteristics are a fair indication of race but are still not as exact as blood type frequencies. Fair warning is given in the last chapter as to possible roads to destruction but the way to human betterment through understanding and our still infinitesimal knowledge of genetics, is equally clear.