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Where do you study? much does wellbutrin prescription cost The 1.8 million-year-old fossil, known as Skull 5, is like nothing seen before. It has a small brain case and a heavy, jutting jaw, as did some of humanity's older, more ape-like ancestors. But other bones linked to Skull 5 show its owner had relatively short arms and long legs, as does our own species, Homo sapiens. Those who've studied Skull 5 say it also provides support for the provocative idea that, 1.8 million years ago, only one kind of early human held sway, rather than the throng of different species listed in today's textbooks.