The shooting carried out at Fort Hood Thursday by accused gunman Maj. Nidal Malik Hasan -- an Army psychiatrist -- has raised new questions about the stresses on mental health caregivers treating patients in conflict zones or combat veterans.

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Medical research suggests a person's positioning on the social hierarchy ladder is intimately related to his or her risk of health and disease. Paul Solman reports on income inequality and the connection between what we earn and how long we…

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