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  1. Till IL-6 Do Us Part: Elderly caregivers show harmful immune effect

    Elderly people caring for their incapacitated spouses experienced dramatic average increases in the blood concentration of a protein involved in immune regulation, a trend that puts them at risk for a variety of serious illnesses.

    By Bruce Bower
  2. Animals

    Moonlighting: Beetles navigate by lunar polarity

    A south African dung beetle is the first animal found to align its path by detecting the polarization of moonlight.

    By Susan Milius
  3. Health & Medicine

    Lethal Emergence: Tracing the rise of dengue fever in the Americas

    Using the genetics of viruses, scientists have tracked a virulent form of dengue virus in Latin America back to its roots in India.