How Do Owls Turn Their Heads Almost Totally Around?

Have you ever wondered how owls can turn their heads almost all the way around without hurting themselves?  Scientists have been mystified up until now.  If humans try to do this, it will cause a stroke or worse.  Now, thanks to medical scans we can see into the anatomical structures that make it possible for owls to safely turn their heads up to 270 degrees without injury.  
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      Barn Owl from flickr.com,   

 http://www.flickr.com/photos/12567713@N00/