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Health & MedicineBad 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 -
AstronomyDawn 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 -
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 -
EarthOxygen Rocks: Volcanoes spurred early atmospheric change
Earth owes its oxygen-rich atmosphere to a change in volcanic activity about 2.5