News

  1. 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
  2. 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
  3. 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.

    By Tina Hesman Saey
  4. Chemistry

    Now, nylon comes in killer colors

    Chemists are improving antibacterial fabrics by treating them with compounds that prolong their killing power and add color.