When an accomplished surgeon sees his own father struggle with arthritis, he knows there are some structural problems in play. HSS surgeon Dr. Michael Parks shares some insights into the processes behind health disparities (or health differences as he prefers to say). Why do some people steadily progress through the steps of intervention, but others languish? What role does race and gender play? Dr. Parks also discusses why the WHO sees health disparities as a social injustice, and why a new bill sponsored by Congressman John Lewis is so important to health equality. With Bill Finerfrock.