Alain Locke is buried at the Congressional Cemetery in Washington, D.C. He lies near many of the nation's early congressmen and next to the first director of the Smithsonian's Museum of African Art. Adam Cole/NPR hide caption

itoggle caption Adam Cole/NPR

Disease susceptibility varies among ethnic groups, but medicine hasn't always recognized that. Jo Unruh/iStockphoto hide caption

itoggle caption Jo Unruh/iStockphoto

Mike Jackson has diabetes and high blood pressure. His eye was damaged after he cut back on insulin because he couldn't afford it. Bryan Terry for NPR hide caption

itoggle caption Bryan Terry for NPR