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  1. Earth

    Perforated blobs may be early sponges

    Odd shapes in Australian rocks could be the oldest fossil evidence of multicellular animals.

    By Susan Milius
  2. Humans

    Most prisoners come from few neighborhoods

    As overall crime rates declined in the United States, certain poor communities fueled a dramatic rise in incarceration rates.

    By Bruce Bower
  3. Life

    Muscles remember past glory

    Extra nuclei produced by training survive disuse, making it easier to rebuild lost strength.

    By Tina Hesman Saey
  4. Humans

    Retirement at 62 boosts well-being

    People who retire on the early side tend to feel better physically and emotionally than those who quit working earlier or later.