Secretary of the Smithsonian Institution Lonnie Bunch says a portrait can restore humanity, as in the case of Henrietta Lacks. She's the woman whose 'immortal' cells were taken without her knowledge and then used to pioneer important medical advances. Bunch, a scholar of American history, also describes images of one of his favorite presidents, Lyndon B. Johnson. As a lawmaker, Johnson had a 20-year record of voting against civil rights. Then he became a force for racial justice.

Check out the images we discuss on our website: https://npg.si.edu/podcasts/speaking-secretary