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An example of a human precision grip — grasping a first metacarpal from the thumb of a specimen of Australopithecus africanus that's thought to be 2 to 3 million years old.
T.L. Kivell & M. Skinner
January 22, 2015 The opposable thumb you use to hold a pencil was long thought to be a defining aspect of humans. But an analysis of finger bones suggests stone tool use by pre-humans — perhaps 3 million years ago.
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Our popular image of Homo erectus as the proto-guy who whose human-like traits all emerged at once needs overhauling, some anthropologists say.
Sylvain Entressangle/Science Source
July 4, 2014 Maybe it was messier than we thought, some scientists now say. Big brains, long legs and long childhoods may have evolved piecemeal in different spots, in response to frequent swings in climate.
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March 6, 2014 "After our primate cousins came down out of the trees, humans evolved on the savanna." You've heard that idea before, but is it true? The debate heats up — way up.
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