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  1. Health & Medicine

    Some T cells may be a fetus’ best friend

    While pregnant, mice overproduce a kind of T cell that reins in other immune cells that might target the fetus.

    By Nathan Seppa
  2. Planetary Science

    A view of Mars, European style

    Although the Mars lander Beagle 2 is presumed dead, its mother craft, the European Space Agency's Mars Express, has transmitted its first data from a polar orbit about the Red Planet.

    By Ron Cowen
  3. Math

    Computing on a Cellular Scale

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

    By Ivars Peterson
  4. 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.