Most airplanes in the world have vertical tails or rudders to prevent Dutch roll instabilities, a combination of yawing and sideways motions with rolling that looks a bit like the movements of a ...
OSWEGO, Ill. -- In the hands of owner Blanca Uribe, a retired racing pigeon named Astrid gets the exercise she needs through "happy flappies," moving her wings while being held because she's paralyzed ...
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