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  1. Earth

    Plate tectonics started at least 3.5 billion years ago

    Analyses of titanium in rock suggest plate tectonics began 500 million years earlier than thought.

    By Carolyn Gramling
  2. Astronomy

    Ultrahigh energy cosmic rays come from outside the Milky Way

    The biggest cosmic ray haul ever points toward other galaxies as the source of the rays, not our own.

    By Lisa Grossman
  3. Paleontology

    Shhhh! Some plant-eating dinos snacked on crunchy critters

    Scientists studying dinosaur poop found that some duck-billed dinos cheated on their vegetarian diets by snacking on crustaceans.

    By Carolyn Gramling
  4. Earth

    Intense storms provide the first test of powerful new hurricane forecast tools

    From Harvey to Maria, this year’s powerful hurricanes are giving scientists’ latest forecasting tools a trial by fire.