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  1. Live Long and Perspire: Exercise may slow aging at chromosomal level

    A new study finds that a sedentary lifestyle is linked to short telomeres on chromosomes, potentially a sign of rapid aging.

    By Nathan Seppa
  2. Humans

    . . . And the Envelope, Please: Forty outstanding young scientists move to final round of competition

    Forty outstanding young scientists will travel to Washington, D.C., for the final round of the 2008 Intel Science Talent Search.

    By Rachel Ehrenberg

  3. Spice It Up: Naked mole-rats feel no pain from peppers, acid

    The African naked mole-rat doesn't feel pain from acid or chilies, a possible adaptation to its cramped underground habitat.

    By Ewen Callaway
  4. Plants

    Traveling tubers

    Potato varieties from Chile arrived in Europe several years before the blights of the mid-1800s, a new analysis of DNA from old plant collections reveals.