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For Your Eyes Only

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Hour 2: Clandestine communication has been a tactic of spies for as long as espionage has been part of war. We’ll talk about the history of secret messages this hour with Georgia Institute of Technology professor Kristie Macrakis. Her new book is Prisoners, Lovers, and Spies: The Story of Invisible Ink from Herodotus to al-Qaeda (Yale University Press).

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