See the full episode at http://video.pbs.org/video/1050822242Long ago in the age of dinosaurs, a volcano in eastern China erupted and buried a host of strange creatures in ash, creating exquisite fossils that preserved a big surprise--many dinosaurs were covered in feathers. In The Four-Winged Dinosaur, NOVA investigates the most bizarre of these feathered dinosaurs, which has rekindled a fierce, decades-long debate over the origin of bird flight.http://www.pbs.org/wgbh/nova/
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