The first waves out of Africa (70+ thousand years ago) are the same, Borneo, Ozzie Aboriginals etc an infinitum. The know the land and how to live off it but haven't built anything of note. The second migrations into these areas and beyond started building temples, significant structures (goblin teki, stone henge, pyramids. Manchu Picchu etc). What changed and why is there pretty much nothing like it in sub Saharan Africa? There are many Africans with extraordinary intelligence but they seem to be the exception not the norm. Is it culture or just a lack of imagination to make their lives bette