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  1. Earth

    A crack and a fault in paradise

    Mauna Loa, Hawaii's most massive volcano, may be splitting the Earth's crust.

    By Ewen Callaway
  2. Animals

    Very brown sheep have a dark side

    Big, dark sheep on a Scottish island are not breaking the rules of evolution after all.

    By Susan Milius
  3. Health & Medicine

    Receptor may be cancer accomplice

    Suppressing a receptor protein called neuropilin-2 slows colon cancer growth in mice.

    By Nathan Seppa
  4. Earth

    Fabulon: Looking less fabulous

    The source of polychlorinated biphenyls found heavily tainting some homes—and their dwellers—appears to be a durable topcoat for hardwood floors that was widely used a half-century ago.