I want to be black, to know black, to luxuriate in whatever I might be calling blackness at any particular time, but to do so in order to come out on the other side, to experience a humanity that is neither colorless nor reducible to color.

Mama and I would go to a funeral and she'd stand up to read the dead person's eulogy. She made the ignorant and ugly sound like scholars and movie stars, turned the mean and evil into saints and angels. She knew what people had meant to be in their hearts, not what the world had forced them to become. She knew the ways in which working too hard for paltry wages could turn you mean and cold, could kill the thing that made you laugh.

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.

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.

In America one drop of black ancestry makes you black. In Brazil, it's almost as if one drop of white ancestry makes you white.

Ever since I watched 'Roots,' I've dreamed of tracing my African ancestry and helping other people do the same.

All historians generalize from particulars. And often, if you look at a historian's footnotes, the number of examples of specific cases is very, very small.