Anyone with a brain knows the Out Of Africa idea is bullshit. The same people that believe this shit probably also believe the Great Pyramids are tombs.
Wait, what are the pyramids?
They sharpen razor blades. Like really sharp.
Artificial mountains designed to create an increase in air pressure and promote rainfall. This for the purpose of controlling the immediate microclimate and greening the desert.
Sadly the project is in abeyance. A full mountain range is needed to build up enough air pressure and the civilization didn't last long enough to see the project all the way through, it might have required 20 generations to build enough pyramids at a rate of one per Pharaoh.
The giant aquifers underneath the pyramids (full of water, like in Dune), are activated when the pyramids are completed - they will be so heavy they squeeze the water out turning the pyramids into giant fountains that kickstart the process.
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