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“Though there is still a large random element, the broad general theme of human history is that each race has developed the institutions appropriate to secure survival in its particular environment. This, then, is the most significant feature of human races: not that their members differ in physical appearance but that their society’s institutions differ because of slight differences in social behavior.”
― Nicholas Wade, A Troublesome Inheritance: Genes, Race and Human History

“Politically oriented scientists often proclaim that there are no distinct human races, seeking to imply, without actually saying so, that races do not exist. One reason that races exist, though not distinctly, is that the features characteristic of a race are often distributed along a gradient. Almost all northern Chinese have the sinodont pattern of dentition, but the farther one goes toward southern China and Southeast Asia, the greater the percentage of people who are sundadonts and the fewer who are sinodonts.”
― Nicholas Wade, A Troublesome Inheritance: Genes, Race and Human History