News

  1. Earth

    More Waters Test Positive for Drugs

    Traces of drugs, excreted by people and livestock, pollute surface and ground waters in the United States, as had already been confirmed in Europe.

    By Janet Raloff
  2. Health & Medicine

    Immune gene linked to prostate cancer

    An immune-cell gene plays a role in predisposing men to prostate cancer.

    By John Travis
  3. Astronomy

    Found: Gamma-ray background information

    Resolving a 30-year-old mystery, astronomers say they have identified the source of the faint, high-energy glow of radiation known as the gamma-ray background.

    By Ron Cowen
  4. Earth

    Much that glitters is really old

    New isotopic analyses of rock samples from one of the world's richest gold-mining regions suggest that the flecks of gold in those ores are more than 3 billion years old.