The various races and ethnicities into which humans have evolved represent a grand experiment in which nature has tested out some of the variations inherent in the human genome. The experiment is not being conducted in our interests - it has no purpose or goal - yet it offers considerable benefits. Instead of there being a single type of human society, there are many, creating a rich diversity of cultures whose more promising features can be adopted and improved on by others.

A Troublesome Inheritance: Genes, Race and Human History (2014)