Lisa Wade is a professor of sociology at Occidental College and the co-author of Gender: Ideas, Interactions, Institutions. You can follow her on Twitter and Facebook.
For years biologists, anthropologists, and sociologists have all agreed that racial categories are social constructs. Recently, however, new genetic information about human evolution has required that scientists re-think the biological reality of race. In this 6-minute video, sociologist Alondra Nelson describes this re-thinking: