A 1.8 million-year-old skull found in the Republic of Georgia has led some researchers to believe that early humans were a single species, Homo erectus, rather than multiple species as generally believed. "We think it is sensible to attribute all specimens to Homo erectus," said neurobiologist Christoph Zollikofer, the study's co-author. That is not to say that all fossil human specimens, modern humans included, are lumped into Homo erectus, Zollikofer said.

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