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  1. Health & Medicine

    Hormone wards off immune cells in womb

    A hormone known for its involvement in the brain's response to stress also plays a key role in shielding the developing embryo from its mother's immune system.

    By Ben Harder
  2. Health & Medicine

    AMA: Drugs are for anthrax, not fear

    Doctors should not use antibiotics prophylactically against anthrax unless there is good reason to believe the individual had encountered the germs directly, the American Medical Association advises.

    By Janet Raloff
  3. Health & Medicine

    Retail meats host drug-resistant bacteria

    Three studies appear to tie livestock growth promoters to risk of serious human disease.

    By Janet Raloff
  4. Earth

    Lowland tree loss threatens cloud forests

    Changes in regional climate brought about by large-scale deforestation in the eastern lowlands of Central America are affecting weather in the mountains downwind, imperiling ecosystems there.