Uncategorized

  1. Humans

    High costs of CT screening

    Whole-body computed tomography scans for asymptomatic disease do not appear cost-effective at this time.

    By Janet Raloff
  2. Earth

    Subway air does extra damage

    Airborne particles in subterranean transit stations may be more damaging to human cells than are particles from street-level air.

    By Ben Harder
  3. Planetary Science

    Meteorite on Mars

    One of the twin rovers on Mars has discovered the first meteorite ever found on a planet other than Earth.

    By Ron Cowen
  4. Humans

    Letters from the February 12, 2005, issue of Science News

    Short end of the chromosome Since “women with chronically ill children generally reported more stress” and since “there was a very striking connection between stress and telomere length” (“Stressed to Death: Mental tension ages cells,” SN: 12/4/04, p.