In the 1930s and 1940s, when polio was rampant in the United States, the predominant treatment method was to immobilize the patient's body in braces and splints. But Sister Elizabeth Kenny, an Australian nurse who resettled in Minnesota in 1940, believed in a controversial alternative method. MN90 Producer Andi McDaniel describes how Kenny revolutionized polio care. Includes an interview with Kate Roberts, author of Minnesota 150, published by the Minnesota Historical Society Press, 2007.