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  1. Chimps ape others to learn tool use

    Chimpanzees appear to develop traditions of tool use by copying one another's behavior and conforming to a successful approach.

    By Bruce Bower
  2. Earth

    Can polluted air cause birth defects?

    For the second time, scientists have found evidence suggesting that prenatal exposure to air pollution may cause certain birth defects.

    By Ben Harder

  3. People with malaria attract more mosquitoes

    The protozoan causing malaria may facilitate its own spread by making people more alluring to mosquitoes.

    By Christen Brownlee

  4. Placebo reins in pain in brain

    Pain relief provided by inert medications may reflect increased transmission of a brain chemical involved in regulating stress and suppressing pain.