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  1. Planetary Science

    Nearby star may have its own asteroid belt

    Observations of warm dust swaddling a young, nearby star suggest that astronomers may have found evidence of a massive asteroid belt outside the solar system.

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  2. Health & Medicine

    Soy estrogens: Too much of a good thing?

    Two studies of female mice suggest that genistein, an estrogen analog found in soy, could contribute to cancer risk.

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  3. Earth

    Memory problems linked to PCBs in fish

    Adult exposures to polychlorinated biphenyls, from eating tainted fish, correlate with lower scores on learning and memorization tasks.

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  4. Materials Science

    Scientists get a handle on crystal shape

    Researchers have discovered how the orientation of amino acid molecules can make a growing crystal take on either a right- or a left-handed form.