The greatest computer ever built is less than 7 in. long and weighs less than 3 lb. It has no moving parts and makes not a sound. And yet it is the home of dreams, of songs, of wisdom, of philosophy, of love, of awareness itself. The greatest computer ever built is, of course, the human brain. For almost as long as we've been thinking creatures, we've wondered about the galaxy of experiences, emotions and insights that lives within every one of us...