THE ORIGIN OF HUMAN RACES AND THE ANTIQUITY OF MAN ... in the physical types of different races; and then we present to him, among the different tribes of man, continual gradations shading ...

Race and ethnicity are two concepts related to human ancestry ... ethnic affiliations more readily than racial ones, though different ethnicities have been folded into racial categories during ...

A new study finds the genetic backgrounds of people in the U.S. are "highly complex" and may differ from their self-defined ...

How are they different, where do they overlap? And how do both impact how we interact with society? To put the definitions in their simplest terms: Race refers to categories of human beings that ...