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Science 9 May 1997:
Vol. 276. no. 5314, pp. 896 - 897
DOI: 10.1126/science.276.5314.896
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Paleoanthropology: Bone Sizes Trace the Decline of Man (and Woman)

Ann Gibbons

A standard picture of human evolution holds that our lineage evolved gradually and inexorably toward a bigger, brainier human. But a new study of the bones of 163 early members of Homo who lived 2 million to 10,000 years ago suggests that after a peak in the last ice age, our bodies--and brains--have shrunk by about 10%.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)