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  1. Health & Medicine

    Bad Bug: Microbe raises stomach cancer risk

    A gene in some strains of the bacterium Helicobacter pylori may greatly increase the risk of stomach cancer.

    By Nathan Seppa
  2. Astronomy

    Dawn of a Disk: Water vapor pours down on embryonic star

    Infrared observations show water vapor pouring down on a planet-forming disk around a young star.

    By Ron Cowen

  3. No-Fight Zones: School programs reduce violence in all grades

    A variety of school-based programs succeed in reducing students' violent and disruptive behavior.

    By Bruce Bower
  4. Earth

    Oxygen Rocks: Volcanoes spurred early atmospheric change

    Earth owes its oxygen-rich atmosphere to a change in volcanic activity about 2.5