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  1. Earth

    Flaming Out? Days may be numbered for two fire retardants

    The maker of two controversial flame-retardant chemicals has voluntarily initiated negotiations with the federal government to end their production.

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  2. Humans

    Letters

    Letters from the Nov. 1, 2003, issue of Science News.

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  3. Earth

    California acts on plastic additive

    Korean engineers have developed a replacement for a plasticizer used in polyvinyl chloride that California has just ruled is a known reproductive toxicant.

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  4. Physics

    New type of material that heat can’t bloat

    A newfound material exhibits the desirable property of not expanding when heated over a wide temperature range, but from an apparent cause never seen before—electrons changing positions inside the new compound's crystal structure.