How is it that chimpanzees can learn to "speak" at a higher level than some so-called wolf children? What happened that day in the pumphouse, when Helen Keller suddenly grasped the meaning of words? And picture this: a father and mother who shun the advice of professionals, who doggedly force their way into the closed world of their autistic son, and who reverse his grim prognosis, revealing him to be gifted. How to explain? In this...