But you see, our society is still trapped in this binary, black/white logic and that has had some very positive implications for our generation. It's had some very negative ones as well and one of the negative ones is that it creates enormous identity problems for people who have one black ancestor and all white ancestors for example.

If you share a common ancestor with somebody, you're related to them. It doesn't mean that you're going to invite them to the family reunion, but it means that you share DNA. I think it's fascinating.

Very few Black people ever embraced back to Africa movements, and very few actually, a tiny number actually went back to Africa. They said, "We are going to make America live up to the ideals of the Declaration of Independence and the Constitution of the United States." They produced one of the world's great cultures; they produced individuals who were just as brilliant and made contributions to the world civilization. In fact, they produced a world-class civilization, the African American civilization, in music, in dance, in oratory, in religion, in writing.

In the old days, you lived in one neighborhood, you knew all your neighbors and your daughter married the guy next door. That was social and economic progress. That model is gone now. We also had a world order that was fraught but fairly stable.

What happened in the interim is, billions of records have been digitized. Historians and scholars have always used genealogical records to tell the story of American history. It takes months and years of research. I can't even tell you how laborious that is. You have to be somebody who has a lot of free time, like a professor who can take tenure or someone with a great deal of leisure.

Suffering does not necessarily ennoble you.

Brazil is the second blackest nation in the world.