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  1. Health & Medicine

    Nifty Spittle: Compound in bat saliva may aid stroke patients

    An anticlotting molecule in the saliva of vampire bats combats strokelike brain damage in mice.

    By Nathan Seppa
  2. Materials Science

    Quick-Change Surface: Material repels water on command

    Researchers have modified a gold surface so that it switches from a water-attracting mode to a water-repelling one on command.

    By Jessica Gorman

  3. Testosterone’s Family Ties: Hormone-linked problems reflect parent-child bond

    Low or high concentrations of the hormone testosterone may contribute to delinquency and depression mainly in children who have poor relationships with their parents.

    By Bruce Bower

  4. Getting Attached: Sugar-protein link joins embryo to Mom

    Biologists may have found the molecular handshake that attaches an embryo to the wall of the uterus.