News

  1. Animals

    Fenced-off trees drop their friends

    Protecting acacia trees from large, tree-munching animals sets off a chain of events that ends up ruining the trees' partnership with their bodyguard ants.

    By Susan Milius
  2. Astronomy

    X-raying a galactic jet set

    The deepest X-ray portrait ever taken of the galaxy Centaurus A highlights its jets and activity around its supermassive black hole.

    By Ron Cowen
  3. Anthropology

    Infectious Voyagers: DNA suggests Columbus took syphilis to Europe

    A genetic analysis of syphilis and related bacterial strains from different parts of the world fits the theory that Christopher Columbus and his crew brought syphilis from the Americas to Renaissance Europe, where it evolved into modern strains of the sexually transmitted disease.