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.

Brazil is the second blackest nation in the world.

Let's face it - think of Africa, and the first images that come to mind are of war, poverty, famine and flies. How many of us really know anything at all about the truly great ancient African civilizations, which in their day, were just as splendid and glorious as any on the face of the earth?

Very few, if any, first-generation black or white or Asian kids will pursue a Ph.D. They'll pursue the professions for economic security. Many will go to law school and/or business school.

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.

Ending the slave trade was contrary to British economic interests. For all its limitations and hypocrisies - British slavery itself, of course, still continued to exist - I still think it was a great moment in human history.

You have a diasporic black world, and the only way to put it back together again is symbolic. It's like Humpty Dumpty. Whoever could edit the 'Encyclopedia Africana' would provide symbolic order to the fragments created over the past 500 years. That is a major contribution.