How ancient flying reptiles ruled the skies: Study uncovers pterosaur tail structures that enhanced flight capabilities
Scientists have long puzzled over how pterosaurs became the first vertebrates to master flight. Some pterosaur species, such ...
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US Air Force winds down HH-60G Pave Hawk operations
The service logged its final active service flight with the venerable Sikorsky combat search and rescue helicopter, as deliveries of the new HH-60W Jolly Green II Combat Rescue Helicopter ramp up.