Bone is a marvel, an adaptable and resilient building material developed over 500 million years of evolutionary history. It has manifested itself in wings, sails, horns, armour, and an even greater array of appendages since the time of its origin. In dinosaur fossils, skeletons are biological time capsules that tell us of lives we'll never see in the flesh. Inherited from a common fishy ancestor, it is the stuff that binds all of us vertebrates together into one great family. Swim, slither, stomp, fly, dig, run - all are expressions of what bones make possible. But that's hardly all. ...