News

  1. 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
  2. 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.

    By Janet Raloff
  3. Earth

    No-stick chemicals can mimic estrogen

    Some of the perfluorinated compounds used to impart nonstick properties to fabrics and cookware can not only activate a receptor for sex hormones but also inappropriately feminize fish.