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  1. Tech

    Brain cells stay in focus as rats roam

    So light that it doesn't weigh down a rat's head, a new microscope mounted over a hole in the awake animal's skull promises to open a window into individual neurons as a rat carries out normal activities.

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  2. Tech

    Natural micromachines get the points

    In custom-made microscopic channels marked with arrows, mobile and thread-like cell structures called microtubules no longer wander aimlessly but slither in a fixed direction—a potential step toward tiny, man-made factories where cellular micromachinery churns out drugs or novel materials.

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  3. Gene defect leads to warts and more

    Scientists have found the gene for an immunodeficiency syndrome.