Dr. David Ansell, a professor of medicine at Rush University Medical Center in Chicago, discusses his new book, “The Death Gap: How inequality kills.” What’s the death gap? Look at it this way: you’re getting on the Chicago Transit Authority’s Blue Line at “The Loop” in downtown, where the average life expectancy is 85 yrs. Go 7 stops south, and you’ll end up in a place whose inhabitants have a life expectancy of 69 — lower than that in Bangladesh. That’s a “death gap” of 16 years. It’s worse in rural America. Drive from Connecticut to rural Mississippi and see some 35 years’ life expectancy evaporate. How did the United States get here? And what are we going to do about it? Clinical Conversations comes to you through the NEJM Group. Executive producer, Kristin Kelley.