Irene Pepperberg teaches animal cognition at Harvard and is an associate research professor at Brandeis. For thirty years, she worked with a remarkable grey parrot named Alex. She's chronicled their relationship in a book: "Alex & Me: How A Scientist and a Parrot Uncovered a Hidden World of Animal Intelligence and Formed a Deep Bond in the Process." Pepperberg talks about her work with Alex with Steve Paulson, and we hear recordings of them at work.