Why do you think everyone needs to be equal in intelligence at all? This is very liberal cultural imperialist attitude, that everyone must be equal, the implication being 'as equal as europeans', in ability to invent and all that. Everyone is different, so what if they aren't able to make a civilisation? Progress is a western superstition. As for egyptians, their leaders were greek. From ptolemy to cleopatra. I dont think this is going anywhere.