Today's show is an encore of some of our favorite recent interviews. Technology journalist Julia Angwin discusses her latest series about the information that companies, websites, and even police agencies can collect about you based on your Internet searches. Then Thomas French gives an account of the secret life of a zoo and its inhabitants, both animal and human. Mike Capuzzo and detective William Fleisher talk about their efforts to solve the world’s most perplexing cold cases. Rosanne Cash looks back on her life and development as an artist.