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Evidence: How Do We Know What We Know?

The Pencil Test

Published:   August 26, 2008
Total Running Time:   00:01:35

Various features of a fossil skull help anthropologists determine what species it belongs to. Here, anthropologist Katerina Harvati explains how a pencil can be used to distinguish between ancient human species.

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Ancient Astronomy, Modern Knowledge

Published:   August 20, 2008
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