Caleen Sisk is the spiritual leader and the tribal chief of the Winnemem Wintu tribe and a last speaker of the language that sustains her people's identity. © Lynn Johnson/National Geographic
Hour 1: What does human society lose when a language disappears forever? We’ll talk this hour with Russ Rymer, whose piece “Vanishing Voices” appears in the July, 2012 issue of National Geographic Magazine.
