News

  1. Humans

    U.S. probably began global fire ant spread

    A genetic study shows that recent international invasions likely originated in the U.S. South, not the species’ native South American range.

    By Susan Milius
  2. Chemistry

    Mad cow-type diseases lie in wait

    Prion infections build quickly in the brain then pause before killing, new research suggests.

    By Tina Hesman Saey
  3. Health & Medicine

    News in brief: Body & Brain

    Baby's first bites make a big impression, and so do European biomedical journals, in this week's news.

    By Science News
  4. Earth

    Ancient fossil sheds light on early evolution of body armor

    A relative of today’s crabs and insects, the 10-legged, 520-million-year-old find may be the earliest known example of its kind with protected, jointed limbs.