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  1. 18986

    If the stones in this article simply were used for grinding ocher to make powder, would not the grinder rough up the surface to make it a better grindstone? The marks may be nothing more than primitive knurls. Rather than art, this looks like a tool to me, not different in principle from flaked flint. […]

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  2. Anthropology

    Stone Age signs of complexity

    Ancient engravings found in South Africa support the theory that humans began to think and behave in symbolic ways a surprisingly long time ago.

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  3. Anthropology

    The gene that came to stay

    A gene thought by some scientists to foster a bold, novelty-seeking personality, as well as attention-deficit hyperactivity (ADHD), apparently spread substantially in human populations over roughly the past 40,000 years.