I would like to expound on my theory, you can too.
I think that Africa is one of the most difficult environments to live in the world, why? Because it probably contains more apex predators than any of the other continents with which to compete with for food. In addition fresh bodies of water were quite scarce and impeded population growth. I think the stagnating of population did much to stymie any leaps in technology. Furthermore it was isolated from the rest of the world for a very long time, reason being the Sahara desert is a gigantic barrier between Africa and Eurasia.
Cultures and nations prosper when they have good trade routes and a lot of neighbours. Just think most of Europe would be far less developed had it not been for the Romans (and the Greeks to a lesser extent).
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