Most scientists believe that human beings evolved in Africa, then migrated from the continent to conquer the world.
But researchers from the University of Tubingen in Germany believe that our ancestry might be more complicated - and significant parts of human evolution might have happened in Europe and Western Asia.
In paleoanthropology, the recent African origin of modern humans, or the "out of Africa" theory (OOA), is the most widely accepted model of the geographic origin and early migration of anatomically modern humans.
Genetic studies and fossil evidence show that archaic Homo sapiens evolved to anatomically modern humans solely in Africa between 200,000 and 60,000 years ago, that members of one branch of Homo sapiens left Africa at some point between 125,000 and 60,000 years ago, and that over time these humans replaced other populations of the genus Homo such as Neanderthals and Homo erectus.
The new theory comes after the discovery of an ape's tooth in Bulgaria - dating two million years after the 'pre-humans' were thought to have died out in Europe.