News

  1. Earth

    When testosterone gets down and dirty

    Testosterone excreted by livestock can pass through soils, which may explain new findings of fish-altering hormonal activity in water downstream of cattle feedlots.

    By Janet Raloff
  2. Astronomy

    X-ray images highlight galaxy collisions

    A new study provides graphic evidence that X-ray observations may be the best way to identify ancient collisions between galaxies.

    By Ron Cowen
  3. Health & Medicine

    SARS vaccine triggers immunity in monkeys

    An experimental vaccine against the SARS virus shows promise in a test on monkeys.

    By Nathan Seppa
  4. Tech

    Gene Screen: Ultrasensitive nanowires catch mutations

    Researchers have devised a nanowire sensor that binds to DNA molecules and produces an electrical signal almost instantaneously.