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  1. Earth

    The magnetic mystery at the center of the Earth

    The history of the planet’s all-important magnetic field has scientists ramping up simulations and lab experiments to resolve a baffling paradox.

    By Thomas Sumner
  2. Climate

    Virtual twister reveals possible source of tornado longevity

    First computer simulation of a long-lived EF5 tornado may reveal why some twisters stick around.

    By Thomas Sumner
  3. Astronomy

    First known exoplanets have few counterparts

    The first known exoplanets were discovered around pulsars — probably one of the least likely places to have been found, astronomers now say.

    By Christopher Crockett
  4. Animals

    Same math describes relationship between diverse predators and prey

    From lions to plankton, predators have about the same relationship to the amount of prey, a big-scale ecology study predicts.