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  1. Animals

    Chimps catch people’s yawns in sign of flexible empathy

    Chimpanzees may show humanlike empathy, as evidenced by their contagious yawning.

    By Bruce Bower
  2. Neuroscience

    Brain chemicals help worms live long and prosper

    Serotonin and dopamine accompany long lives in C. elegans worms under caloric restriction.

    By Laura Sanders
  3. Health & Medicine

    Second wave of bird flu ups pandemic worries

    The H7N9 avian influenza virus, which first appeared in 2013, is sweeping China with a second, larger wave of illness.

    By Tina Hesman Saey
  4. Life

    Acid-bath method for making stem cells under fire

    No one has been able to reproduce a new technique for creating stem cells called STAP cells, leading some researchers to call for the retraction of the original research papers.