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  1. Physics

    Swift Lift: Birds may get a rise out of swirling air

    The wings of airborne birds may generate whirlpools of air to produce lift for flying, just as insects do.

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  2. Health & Medicine

    Smog Clogs Arteries: Pollution does lasting harm to blood vessels

    Air pollution does long-term damage to people's arteries, leading to increased risk of heart attack and stroke, a Los Angeles study confirms.

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  3. Astronomy

    Disks of Dust: Planet-stuff surrounds other sunlike stars

    Two orbiting observatories for the first time are homing in on planetary debris circling sunlike stars.

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  4. Cloning Milestone: Monkey embryos urged to stem cell stage

    Researchers have coaxed cloned rhesus macaque embryos to grow to the blastocyst stage, the furthest point yet reached in cloning a nonhuman primate.