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  1. Astronomy

    Bare-Naked Galaxies

    A decade's worth of observations is spotlighting how the vast sea of gas surrounding a cluster of galaxies can alter the shape of a galaxy plowing through it.

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  2. Tech

    The rat in the hat

    A compact positron-emission tomography (PET) brain scanner may make possible studies of awake rats that link brain functions and behaviors.

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  3. 19380

    In answer to this article, infections elevate activity of the immune system, so they might indirectly suppress tumors of all kinds. If so, antibiotics could increase the incidence of cancer by reducing the duration and degree of infection. The widespread practice of sterilizing our home and work environments could have a similar effect.