However, scientists have discovered a hominin skull in Georgia, the country not the American state, that dates back to about 1.8 million years ago. The Georgian hominin is something that predates Homo Erectus. It is a smaller, dumber probable ancestor that likely used very basic tools similar to those of Homo habilis. At this stage of evolution habilis and the Georgian hominin look more ape-like than modern human.
The Georgian hominin may be evidence that Homo erectus evolved in Eurasia and not in Africa. However, if that is true something massive like climate change or alike forced humans out of Eurasia and back into Africa.
Regardless, the find is fascinating. Clearly we know only a small bit of our own history. Mapping the ebb and flow of migration and understanding the why behind it will answer old question but raise new ones as we try to understand just how man rose to the top of the world.