Wonderbread vs artisanal bread. It may seem like a simple choice between variants of the same thing, but for many the two are a universe apart -- one representing industrial production and American hubris; the other a wholesomeness that bespeaks a different way of being in the world. Food scholar Aaron Bobrow-Strain has written a social history of white bread. He discusses the unexpected consequences of trying to change the world with food. (Encore presentation.)