An Asian dig site has yielded fossils of some of our earliest ancestors found outside of Africa. When scientists unearthed five skulls dating to the same period, questions arose over how much individual specimens can vary and still belong to the same species. The skulls all represent Homo erectus but are as structurally different as some species in our family tree.
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Science: A Complete Skull from Dmanisi, Georgia, and the Evolutionary Biology of Early Homo sciencemag.org/content/342/6156/326.full.html
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