The analysis of a complete, approximately 1.8-million-year-old hominid skull from Dmanisi, Georgia, suggests that the earliest members of the Homo genus actually belonged to the same species.

This method allowed a more accurate dating than techniques used in other fossil findings, such as Australopithecus and Ardipithecus, two of the oldest known pre-humans.

Ardi, short for Ardipithecus ramidus, is a million years older than the famous "Lucy" fossil. Last October, it was hailed as a window on early human evolution.