What's a good book for a non-scientist to read on human evolutionary differentiation?
My wife is Asian and has been wondering how Asians came to have the characteristics they do, and likewise how other racial groups arose. Bearing in mind that her education and career experience was in art, not the sciences, what would be a good book to get her that would explain the genetic drift of isolated populations?
This question is in the General Section. Responses must be helpful and on-topic.