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  1. Psychology

    Confusion lingers over health-related pros and cons of marijuana

    50 years ago, the effects of chronic marijuana smoking on mental health were hazy. They still are.

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  2. 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.

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  3. 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.

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  4. 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.