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  1. Health & Medicine

    Dengue strikes United States

    Texas has been hit with the first-ever outbreak of dengue hemorrhagic fever in the continental United States.

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  2. Animals

    Ivory-billed hopes flit to Florida

    There's no photo, but a team of ornithologists says that its sightings suggest that a few ivory-billed woodpeckers still live along the Choctawhatchee River in Florida.

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  3. Physics

    Electromagnetism could ease the flow in oil pipelines

    A few minutes of exposure to a magnetic or electric field sharply reduces crude oil's viscosity for hours at a time.

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  4. Itsy bitsy genome

    Researchers have sequenced the smallest genome yet discovered, a string of DNA belonging to a species of bacterium that lives inside sap-eating insects' guts.