I find that people today tend to use them interchangeably. I use African-American, because I teach African Studies as well as African-American Studies, so it's easy, neat and convenient. But sometimes, when you're in a barber shop, somebody'll say, "Did you see what that Negro did?" A lot of people slip in and out of different terms effortlessly, and I don't think the thought police should be on patrol.

Conspiracy theories are an irresistible labor-saving device in the face of complexity.

So when you do your family tree and Margaret Cho does hers, and... Wanda Sykes and John Legend... we're adding to the database that scholars can then draw from to generalize about the complexity of the American experience. And that's the contribution that family trees make to broader scholarship.

What people forget is that the most radical thing about Obama is that he was the first black man in history to imagine that he could become president, who was able to make other Americans believe it as well. Other than that, he is a centrist, just like I try to be. He's been bridging divisions his whole life.

Instill respect for teachers.

In fact, the class divide in the black community is now seen by some as a permanent aspect of our existence.

Without doubt, President [Barack] Obama is a great historical figure.