1.8 million-year-old fossils are a `` snapshot in time , '' researcher says . Score: 6 Study authors argue there was one Homo erectus lineage that left Africa for Eurasia . The biggest brain case found at Dmanisi is 75 % larger than the smallest one , which is consistent with what is observed in modern humans , said study co-author Christoph Zollikofer of the Anthropological Institute in Zurich . Other anthropologists do n't buy the argument but say skull is important .
1.8 million-year-old fossils are a `` snapshot in time , '' researcher says . Score: 6 Study authors argue there was one Homo erectus lineage that left Africa for Eurasia . Other anthropologists do n't buy the argument but say skull is important .