Feature

  1. Health & Medicine

    Fighting Herself

    Autoimmune diseases are more common in women than in men, and researchers are beginning to tease out the cellular mechanisms that may be responsible for this phenomenon.

    By Damaris Christensen
  2. Astronomy

    A Rocky Bicentennial

    Mounting evidence that many asteroids aren't solid rock but collections of loosely bound fragments could have far-reaching implications for elucidating their internal structure, understanding planet formation, and developing strategies to mitigate the threat of one striking Earth.

    By Ron Cowen

  3. Alarming Butterflies and Go-Getter Fish

    Recent studies suggest that there may be more ways to create new species than Darwin imagined.

    By Susan Milius
  4. Earth

    Power Harvests

    Farmers are finding that commercial wind power is the best new commodity to come along in years, one that can offer substantial year-round income.