News

  1. 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
  2. Planetary Science

    Rovers in overtime

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

    By Ron Cowen
  3. Astronomy

    Puzzle on the Edge: The moon that isn’t there

    Contrary to predictions, Sedna, the most distant object known in the solar system, does not appear to have a moon.

    By Ron Cowen
  4. Materials Science

    Crafty Carriers: Armoring vesicles for more precise and reliable drug delivery

    Materials scientists are designing tough, microscopic drug-delivery vesicles that could reach their targets intact and release their cargoes on cue.