News

  1. Earth

    Hurricanes churn up life-nurturing brews

    Images of the North Atlantic taken from orbit suggest that hurricanes churn the ocean's surface enough to bring cool, nutrient-rich waters to the surface, thereby stimulating algal blooms that can last for weeks.

    By Sid Perkins
  2. Health & Medicine

    CT scan no match for colonoscopy

    Colonoscopy is better at detecting potentially dangerous colon polyps than computed tomography scanning is.

    By Nathan Seppa
  3. Planetary Science

    Rovers in overtime

    NASA has extended the missions of the twin Mars rovers by 5 months, through September 2004.

    By Ron Cowen
  4. Earth

    Prenatal exposures affect sperm later

    Boys exposed in the womb to hormone-mimicking pollutants may mature into men who produce impaired sperm.