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  1. Oldest siblings show slight IQ advantage

    The oldest boys in families, including those who became oldest after the death of an earlier-born brother, have a slight IQ edge over their younger siblings.

    By Bruce Bower

  2. Enzyme is target in parasite

    The flatworm that causes the tropical disease schistosomiasis may be vulnerable to drugs that neutralize an essential enzyme in the parasite.

    By Nathan Seppa
  3. Physics

    Pas de deux for a three-scoop particle

    Physicists have discovered the first particle containing one member of each of the three families of quarks.

    By Davide Castelvecchi
  4. Health & Medicine

    Linking stress and senility

    A gene that's active in the brain may help explain why emotional stress seems to increase a person's likelihood of getting Alzheimer's disease.