In this very special episode of Talk Nerdy, Cara celebrates her 300th episode with award-winning science communicator Ann Druyan. They talk about her life and work with her late husband Carl Sagan as well as her role as the creator, writer, and director of Cosmos: Possible Worlds (the new book and television series). Finally, they discuss the dire consequences of a planet without compassion, empathy, and deep humanity--characteristics we need now more than ever.