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  1. Chemistry

    Power plants: Algae churn out hydrogen

    Green algae can produce hydrogen, a clean-burning fuel that could one day power pollution-free cars.

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  2. Physics

    Manhandled molecules, midget memories

    A thick coating of organic chemicals can record information at densities potentially a million times greater than is possible with current compact disk technology.

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  3. Archaeology

    Vase shows that ancients dug fossils, too

    A painting on an ancient Corinthian vase may be the first record of a fossil find.

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  4. Animals

    New frog-killing disease may not be so new

    The skin disease that savaged amphibians in remote wildernesses in the 1990s has been linked to outbreaks in the 1970s.