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A new study shows two species of early human ancestors used their hands for both climbing and tool-making. To study how ancient humans used their hands, scientists used 3D scanning to measure and analyze the bone thickness of fingers. They focused on the fossil hands of two early human ancestor species recovered from excavations in southern Africa. Both ancient human species showed signs of simultaneously using their hands to climb and to manipulate objects or make tools. The research was published Wednesday in Science Advances.
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