Hour 1: This hour we speak with New York Times reporter Jo Becker, who wrote a book detailing the marriage equality initiative that started with California’s Proposition 8.

Hour 2: Sending messages using invisible ink has long been a tactic of spying and we’ll talk about this with Georgia Institute of Technology professor Kristie Macrakis. Her new book details the history of secret communication in “Prisoners, Lovers, and Spies: The Story of Invisible Ink from Herodotus to al-Qaeda.”