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  1. Planetary Science

    Pluto: A timeline of 85 years of discovery

    Several observations in the last 85 years have given astronomers a little more information about Pluto, and the July 2015 flyby will offer the closest look yet at the solar system's far-flung satellite.

    By Christopher Crockett
  2. Physics

    The arrow of time

    Gravity may explain how time always runs forward, even though the laws of physics should permit it to run backward.

    By Andrew Grant
  3. Paleontology

    Ancient comb jellies might have had skeletons

    Soft and filmy today, comb jellies might once have had rigid skeletons.

    By Susan Milius
  4. Anthropology

    Monkey’s small brain shows surprising folds

    An ancient monkey’s tiny brain developed folds, raising questions about primate evolution.