The concept of race has historically signified the division of humanity into a small number of groups based upon five criteria: (1) Races reflect some type of biological foundation, be it Aristotelian essences or modern genes; (2) This biological foundation generates discrete racial groupings, such that all and only all members of one race share a set of biological characteristics that are not shared by members of other races; (3) This biological foundation is inherited from generation to generation, allowing observers to identify an individual’s race through her ancestry or genealogy; (4) Genealogical investigation should identify each race’s geographic origin, typically in Africa, Europe, Asia, or North and South America; and (5) This inherited racial biological foundation manifests itself primarily in physical phenotypes, such as skin color, eye shape, hair texture, and bone structure, and perhaps also behavioral phenotypes, such as intelligence or delinquency.