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Scientists have unearthed the most complete jaw yet discovered from a predecessor of humans who lived more than 3 million years ago. The jaw, at left, was assembled from 109 fragments found at Maka, Ethiopia. It and other remains from Australopithecus afarensis found in 1990 at Maka are about 3.4 million years old, anthropologist Tim White reports in the journal Nature. The jaw at right is among perhaps the most famous remains of afarensis, a partial female skeleton dubbed Lucy. Comparison of an armbone from Maka to Lucy's strengthens the argument that she was a small afaren-sis, not a member of a separate species, White said.