WE OFTEN speak of "changing the world," and yet we have had such limited success when it comes to changing ourselves, our own stubborn human nature. From Robinson Crusoe's musket to Oppenheimer's atomic bomb, we are adept at adding ingenious new items to our technological toolbox--but in using them, we prove ourselves to be the real savages on the island. Thankfully, though, we do have more enlightened journeys to emulate. Consider warrior, activist, and visionary Miller Brittain, whose love for his fellow human ...