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  1. Math

    Computing on a Cellular Scale

    The behavior of leaf pores resembles that of mathematical systems known as cellular automata.

    By Ivars Peterson
  2. Math

    Computation’s New Leaf

    Plants in which large numbers of simple units interact with one another appear to compute how to coordinate the actions of their cells effectively.

    By Erica Klarreich
  3. 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.

    By Ron Cowen
  4. 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.