(Reuters) - You've heard of the Model T Ford, the famed early 20th-century automobile that was the forerunner of the modern car. But how about the Model T shark? Scientists on Wednesday announced the discovery of the impeccably preserved fossilized remains of a shark that lived 325 million years ago in what is now Arkansas, complete with a series of cartilage arches that supported its gills and jaws. :snip: Employing sophisticated equipment at the European Synchrotron in France, the scientists used high-resolution X-rays to obtain a detailed view of the shape and organization of the arches and associated structures. They...