We peer inside the brains of people contemplating moral dilemmas, watch chimps at a primate research center share blackberries, observe a playgroup of 3 year-olds fighting over toys, and tour the country's first penitentiary, Eastern State Prison. Also: the story of land grabbing, indentured servitude and slum lording in the fourth grade.
Listen or learn more about this week's episode of Radiolab.