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  1. 19517

    This article overlooks an immeasurable long-term cost of whole-body computed tomography scans: the potential cancers induced by high-dose radiation. Aggressive marketing of CT scans without full disclosure of the risk is unethical and should be illegal. Nancy EvansSan Francisco, Calif.

    By Science News
  2. 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
  3. 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
  4. 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.