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  1. Earth

    Spread Out: Organic matter scatters carbon nanotubes in water

    Although carbon nanotubes usually clump in water, they readily disperse when the water contains natural organic matter.

    By Aimee Cunningham

  2. Hottest Fixer: Undersea-vent microbe sets nitrogen record

    A spherical microbe from the weird world of hot-water ocean vents has trumped the nitrogen-processing powers of all organisms previously studied.

    By Susan Milius

  3. 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.

    By Bruce Bower

  4. 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.