News

  1. Animals

    New Butterfly: High-alpine species from low-life parents

    Little bluish butterflies high in the Sierra Nevada could be one of the few animal species to have arisen from crossbreeding of two other species.

    By Susan Milius
  2. Health & Medicine

    Cancer Link: Gene regulates progesterone effect on breast cells

    The BRCA1 protein regulates the effect of pro-growth progesterone, which could explain why having a mutated BRCA1 gene predisposes a woman to breast cancer.

    By Nathan Seppa
  3. Earth

    Leaden swan song

    Large numbers of trumpeter swans are succumbing to lead poisoning as a result of ingesting old shotgun pellets in areas where use of lead shot has been banned for more than a decade.