Caramel, I wouldn't recommend reading the book, "The Bell Curve," and using it as citation in a discussion like this one. Not only does it base arguments on factually incorrect assumptions, the authors did not submit their work to be peer-reviewed. There is debate of the book being politically-motivated since it was written alongside other books around a political project rather than a piece of scientific work. We can disagree or agree on the third point. Take that book with a grain of salt.

vizekonig- where do you study? I'm curious. There are conclusions from the Human Genome Project that there are more biological differences between individuals of the same "race" than persons of different "races."

I mean, for a homogeneous society (focusing on genetics)- wouldn't that mean it is better to have persons of different racial categories than just a group of persons of the same racial category?