The personal factors behind the great inventions and discoveries that change the world are often overlooked, to history's loss, and nowhere has this been more true than in the case of Alexander Graham Bell, inventor, experimenter in genetics and aerodynamics, great-hearted friend and teacher of the handicapped. Without his wife's part in it, his story is only half told. At first the couple seemed a rather unlikely match. Grown to a charming, self-assured...