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PhysicsSwift 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.
By Peter Weiss -
Health & MedicineSmog 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.
By David Shiga -
AstronomyDisks of Dust: Planet-stuff surrounds other sunlike stars
Two orbiting observatories for the first time are homing in on planetary debris circling sunlike stars.
By Ron Cowen -
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.