Schizophrenia is one of the most complex and disabling diseases to affect mankind.   Relatively little is known about its nature and its origins, and available treatments are inadequate for most patients. As a result, there are inevitable controversies about what causes it, how to diagnose it, and how best to treat it.   However, in the past decade, there has been an explosion of new research, with dramatic discoveries involving genetic etiology and epidemiological risk facto