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  1. Health & Medicine

    Gut bacteria reflect dietary differences

    A comparison of African and European children concludes that high-fiber, low-fat diets cultivate healthier intestinal microflora.

    By Gwyneth Dickey
  2. Life

    Marine census still counting new life-forms

    The Gulf of Mexico ranked among the top five marine regions for number of known species.

    By Susan Milius
  3. Life

    Disabling cellular assassin prevents cancer

    A counterintuitive experiment may help explain why survivors are more vulnerable to other malignancies later in life.

    By Tina Hesman Saey
  4. Life

    For ducks, penis length depends on the other guys

    Male genitals grow longer with more competition from other males.

    By Susan Milius
  5. Space

    Dark matter eldorado

    Astronomers have discovered that a nearby galaxy has the highest density of dark matter of any galaxy known.