The first humans
Scientists agree that our early ancestors, Homo erectus, first appeared in Africa between one and two million years ago. They spread throughout the world and evolved into ancient humans. But did ancient humans evolve into modern humans all over the world at around the same time (the 'multiregional' theory)? Or did modern humans evolve in Africa, and gradually replace all the other ancient humans (the 'Out-of-Africa' theory)? Either way, by about 30,000 years ago, we - Homo sapiens - were the only humans left on the planet.