Agriculture was discovered only once in Saudi Arabia, then China some years later, most probably by accident. From Saudi Arabia it spread to everyone, slowly, with migration. The Sahara was prohibitive. So I don't see how you ask Africans why they didn't stumble onto agriculture like the other 99% of human beings who were all apparently 'waiting' for it to be brought to them.
I see your point and am quite happy to be schooled. Agriculture, domestication of animals, writing, printing, the enlightenment age in Europe, etc - Africa seemed to miss out on most evolutional windfalls.
Nah, Robina. I think you still don't see what I'm trying to say, because all those 'evolution windfalls' you mention came well after agriculture and as a result of it. Unless you are arguing Africans should've been different from all other humans and had all those things from pre-agricultural society. But no one had those things pre-agriculture and the African is among the last to find agriculture, merely because of ancient migration patterns. Every other society that did not come into contact with agriculture is a hunter-gatherer to this day. Again, I just don't see how adding to that list, that depends on agriculture in the first place, strengthens the idea that the African is uniquely innately incapacitated. Just doesn't add up.
It seems clear to me that the African, like absolutely everyone else on the planet, was a happy hunter-gatherer until he found this strange thing some people were doing with the land, called agriculture, 3,000 years ago, and it began revolutionalizing his society like it had every other human society it had crawled its way into in pretty much the same ways: making it more and more complex and centralized: They began looking more and more like what we would recognize as proto-states. This stuff is not because of intelligence but because agriculture creates a permanent attachment to land, the need for controlled labour, and enables a population boom, all of which leads to more and more complexity/the need for central organization over time.