What is mind?
What is matter?
To man through most of history, the mind has seemed too marvelous to be made up of mere matter. Yet it obviously consists of some arrangement of molecules in the brain that work collectively to remember and reason. Last week in San Francisco, a score of the world's most eminent scientists of the mind heard Swedish Neurobiologist Holger Hyden (pronounced he-dam), 43, offer a theory about the chemistry of thought. Hyden, who is chief of tissue studies at the University of Goteborg, even named...