I think that the roots of racism have always been economic, and I think people are desperate and scared. And when you're desperate and scared you scapegoat people. It exacerbates latent tendencies toward - well, toward racism or homophobia or anti-Semitism.

So, Mexico, Brazil, they wanted their national culture to be 'blackish' - really brown, a beautiful brown blend. And finally, I discovered that in each of these societies the people at the bottom are the darkest skinned with the most African features.

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.

My father and I made genetics history. We were the first African-Americans and the first father and son anywhere to have their genomes sequenced.

I'd say imagine that you wake up one morning when you're going through a midlife crisis. You're getting divorced. Your kids won't speak to you. Their faces are covered with acne, and you have to decide why you should get out of bed. That's the career you should pick. The one that keeps you going no matter what, even if your life is falling apart. That's how I feel about my career.

Our society is driven today by so much ethnic discord. We have Black Lives Matter, which I praise and celebrate. We have the demagogues stereotyping Muslims and resurrecting racist stereotypes they used to visit on us. The larger goal is to show that we are all the same, we all come from Africa, and we all have the same larger family tree. It's about the fundamental unity of the human community.

Since the day Martin Luther King was killed, the black middle classes have almost quadrupled, but the percentage of black children living on or below the poverty line is almost the same.