A 25-year-old backcountry wanderer, a man happiest exploring wild places with his dog, Dan Bigley woke up one midsummer morning to a day full of promise. Before it was over, after a stellar day of salmon fishing along Alaska's Kenai and Russian rivers, a grizzly came tearing around a corner in the trail. Dan barely had time for "bear charging" to register before it had him on the ground, altering his life forever. "Upper nose, eyes, forehead anatomy...