At a site in Dmanisi, Georgia, researchers have been finding the bones and tools of early human ancestors for years. Now, however, an unearthed skull is posing something of a problem.
The top of its head is relatively small, resembling a humanlike species known as Homo habilis; but its jaw is fairly large, more closely resembling another species, Homo erectus. Naturally, a single skull can only come from a single species, but this one seems to be telling two separate stories.
