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  1. Sleeper Effects: Slumber may fortify memory, stir insight

    In two separate studies, researchers found that a specific sleep stage may amplify recent memories and that sleep can inspire problem-solving insights.

    By Bruce Bower

  2. Pushing Cancer over the Edge: Compounds trigger tumor-cell suicide

    Compounds that free cancer cells to commit suicide slow tumor growth.

    By John Travis
  3. Plants

    Dawn of the Y: Papaya—Glimpse of early sex chromosome

    Genetic mappers say that the papaya plant has a rudimentary Y chromosome, the youngest one in evolutionary terms yet found, offering a glimpse of the evolution of sex chromosomes.

    By Susan Milius
  4. Planetary Science

    Spirit Gets Its Wheels Dirty: Mars rover begins scientific work

    Spirit, the rover that landed on Mars on Jan.