2 million years ago we had Homo Erectus leaving Africa for Eurasia and beyond. Two more mass 'Out of Africa' migrations are theorized, the last one about 200,000 years ago. Will this current out of Africa exodus be recorded in the future as the fourth major migration? And if so will the current predictions of 90m population for Lagos and 80m for Kinshasa etc, really be only half of those numbers with the other half be in Germany, France and other Euro countries?
