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Planetary ScienceNearby 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.
By Ron Cowen -
Health & MedicineSoy 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.
By Nathan Seppa -
EarthMemory problems linked to PCBs in fish
Adult exposures to polychlorinated biphenyls, from eating tainted fish, correlate with lower scores on learning and memorization tasks.
By Janet Raloff -
Materials ScienceScientists 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.