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  1. Tech

    Oceans of Electricity

    The world's first commercial wave-power plant began pumping current into a Scottish island's electric grid last winter, just ahead of a host of competing schemes for converting ocean-wave motion into electricity.

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  2. Health & Medicine

    Fatty Findings

    A recently discovered protein may explain at least part of the molecular mechanisms behind links among obesity, diabetes, heart disease, and even some cancers.

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  3. Caving in Comfort

    Explore the wonders of solution caves, lava tubes, sea caves, and other underground realms at this beautifully illustrated Web site, developed by caver and photographer Dave Bunnell. The site features photographs of caves throughout the world and maps of idealized “virtual” caves, which explain and illustrate examples of nature’s handiwork.