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  1. Seek and Destroy: Virus attacks cancer, spares normal cells

    A virus carried by mosquitoes naturally homes in on cancer cells and destroys them.

    By John Travis
  2. Earth

    Cloud Chemistry: Atmospheric scientists dissect cirrus clouds

    Cirrus cloud formation is influenced by the particles in the atmosphere, including pollutants.

    By Kate Ramsayer
  3. Astronomy

    Solar Flip-Flops: Sun storms spawn magnetic reversal

    Coronal mass ejections, billion-ton clouds of charged particles blasted from the sun, appear to play a key role in reversing the sun's magnetic poles every 11 years.

    By Ron Cowen
  4. Health & Medicine

    No Scope: CT scan works as well as colonoscopy

    A computed tomography scan of the large intestine works as well as colonoscopy in detecting signs of colon cancer.