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  1. Cancer patients accentuate the positive

    Group therapy that promotes positive types of personal growth in breast cancer patients may also result in beneficial physiological changes.

    By Bruce Bower
  2. Agriculture

    Bt corn variety OK for black swallowtails

    The first published field study of butterflies and genetically altered corn finds no harm to black swallowtail caterpillars from a common corn variety.

    By Susan Milius
  3. Health & Medicine

    Keeping the beat

    Muscle cells taken from embryonic rats and put into an adult rat's heart can transmit the electric signals that govern the heartbeat.

    By Damaris Christensen
  4. Tech

    Robotic heart surgery

    By using robotic rather than conventional open-heart techniques, doctors can perform heart surgery with smaller incisions, giving patients less pain and speeding recovery.