It's on the tip of my finger! Sign language, deaf culture and the brain

LA comedian CJ Jones is a master storyteller in sign language. San Diego scientist Stephen McCullough studies the neurobiology of sign language. Both are deaf. Sign language is revealing surprising insights into the evolution of all human languages in the brain. From finding the word on the 'tip of the finger' to the bilingual brains of speakers and signers -- join two performers and two scientists with unique stories from the frontiers of deaf culture.