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  1. 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.

    By Bruce Bower
  2. 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.

    By Bruce Bower
  3. Astronomy

    All Aglow in the Early Universe

    Was the infant cosmos a star-making machine?

    By Ron Cowen
  4. Ecosystems

    Tadpole Science Gets Its Legs . . .

    The amazingly complex tadpole now shines in ecological studies.