John F. Kennedy's Race to the Moon led to a multi-billion-dollar industry. Mapping the Human Genome returned $140 for every $1 invested. Now President Obama wants to jump-start a "map" of the human brain, to find how each of 100 billion neurons relates to all of the others. It's a task so complex new tools would be needed with consequences nobody can predict. Would it mean understanding Alzheimer's or Parkinson's? Would it be the key to human consciousness — and the alarming ability to control how people think?