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Helicopters are more maneuverable than planes or any other small aircraft. While a plane can only move forward, a helicopter can hover in place, move side-to-side, rotate 360 degrees, and even fly backwards. These amazing capabilities make helicopters extremely versatile. They're used as rescue craft, military vehicles, and law enforcement and surveillance craft.
from: http://ezinearticles.com/?How-Helicopters-Work&id=705604
