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  1. Sniffle-Busting Personalities: Positive mood guards against getting colds

    People with generally positive outlooks show greater resistance to developing colds than do individuals who rarely revel in upbeat feelings.

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  2. 19771

    Is the causal relationship between mood and immune system response so obvious? Could not a healthier immune system cause a more positive outlook, rather than the other way around? Lester WelchAiken, S.C.

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  3. Astronomy

    Comet Sampler: Specimens show that inner and outer solar system mixed

    Just as the solar system was forming some 4.6 billion years ago, some of the hottest material, residing so close to the sun that it was almost vaporized, sped out to the chilliest reaches of deep space, where it became incorporated into comets.