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  1. Climate

    Arctic passageways let species mingle

    People aren’t the only animals likely to use passages that open up as the Arctic melts.

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  2. Physics

    The science of avalanches

    High-tech instruments are helping researchers study how temperature can change the character — and danger — of an avalanche

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  3. Physics

    Halo of light crowns Antarctica

    Ice crystals in the air bend sunlight into a ring over a research base in eastern Antarctica.

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  4. Particle Physics

    Dark matter helped destroy the dinosaurs, physicist posits

    In ‘Dark Matter and the Dinosaurs,’ Lisa Randall finds connections between particle physics, cosmology, geology and paleontology.