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  1. Paleontology

    Dinosaur tracks show walking and running

    A single trail of dinosaur footprints found in a British limestone quarry preserves a record of two different walking styles in the same animal, a tantalizing clue that some types of lumbering, bipedal dinosaurs could also run if the need arose.

    By Sid Perkins
  2. Planetary Science

    Galileo at Jupiter: The goodbye tour

    After more than 6 years spent touring Jupiter and its four largest moons, the Galileo spacecraft’s mission is beginning to wind down.

    By Ron Cowen

  3. Infants emerge as picky imitators

    By the age of 14 months, babies display a feel for evaluating the sensibility of an adult's behavior and either imitating the means to a goal or opting for a simpler way to achieve the same result.