News

  1. Animals

    That special wax lasts after courtship

    Sandpipers' special wax for their wings during the breeding season may have less to do with courting a mate and more to do with sitting on eggs.

    By Susan Milius
  2. Health & Medicine

    Stressing out

    A gene variant reduces people's response to the stress hormone cortisol, and people with the variant are less likely to have risk factors for heart disease and diabetes.

    By Damaris Christensen
  3. Archaeology

    Maya warfare takes 10 steps forward

    The discovery of hieroglyphic-covered steps on the side of a Maya pyramid has yielded new information about warfare between two competing city-states around 1,500 years ago.

    By Bruce Bower
  4. Health & Medicine

    Asthma pressure may shrink airways

    Mechanical stress from constricting muscles could cause airway-lining cells to reproduce, eventually thickening the lining and narrowing the air passage.