When is sorrow a sickness? Why do so many people seem to suffer from depression today? Do all cultures suffer from depression? These are a few of the questions we will discuss tonight when we talk with JONATHAN SADOWSKY. He is a professor in the history of medicine at Case Western Reserve University. His new book looks at all aspects of depression: its history, the evolution of treatments, and much more: THE EMPIRE OF DEPRESSION: A NEW HISTORY. Listen to “Inquiry” with Mark Lynch here.