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  1. Earth

    No-stick chemicals can mimic estrogen

    Some of the perfluorinated compounds used to impart nonstick properties to fabrics and cookware can not only activate a receptor for sex hormones but also inappropriately feminize fish.

    By Janet Raloff
  2. Earth

    Sharks, dolphins store pollutants

    Florida's top aquatic predators are rapidly accumulating high concentrations of brominated flame retardants and other persistent toxic chemicals.

    By Janet Raloff
  3. Earth

    Could Prozac muscle out mussels?

    Antidepressant drugs may be depressing wild-mussel populations.

    By Janet Raloff
  4. Health & Medicine

    Test identifies people at cardiac risk

    Measurement of an electrical abnormality in the heart aids doctors in determining who is most at risk for cardiac arrest.