Feature

  1. Archaeology

    Openings to the Underworld

    Archaeological finds indicate that ancient groups in Mexico and Central America, including the Maya, held beliefs about a sacred landscape that focused on natural and human-made caves as sites of important ritual activities and burials.

    By Bruce Bower
  2. Health & Medicine

    A Model Mouse

    Mice with symptoms similar to rheumatoid arthritis may illuminate the puzzling disorder.

    By John Travis
  3. Earth

    Tornado Alley, USA

    A new model that simulates 30,000 years worth of tornadoes in the United States finds that the place not to be if you fear funnel clouds is southeastern Oklahoma, where any particular spot can expect to get damaged once every 4,000 years.