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  1. Health & Medicine

    Chip of tooth tells radiation dose

    A two-milligram dot of tooth enamel serves as a radiation dosimeter.

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  2. Space

    Shaving extra dimensions

    More news from the American Physical Society meeting.

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  3. Life

    Hydrothermal vents sometimes colonized from afar

    Deep-sea currents can waft larvae hundreds of kilometers.

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  4. Plants

    Losing life’s variety

    2010 is the deadline set for reversing declines in biodiversity,  but little has been accomplished.

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  5. Health & Medicine

    Carotid procedures test about equally

    Study finds similar stroke risks after surgery or stents.