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  1. Warning issued for trauma debriefing

    Efforts to get survivors of a variety of life-threatening situations to vent their emotions in debriefing sessions may do no good, or even cause harm in some cases, a research review finds.

    By Bruce Bower
  2. Planetary Science

    Did rivers once run on the Red Planet?

    A fan-shaped region of debris on Mars is providing new evidence that some places on the Red Planet, now bone-dry, once had long-lasting rivers or lakes.

    By Ron Cowen
  3. Planetary Science

    Did rivers once run on the Red Planet?

    A fan-shaped region of debris on Mars is providing new evidence that some places on the Red Planet, now bone-dry, once had long-lasting rivers or lakes.