295331 external_news 1399376657 1475893625 "In the world of espionage, secret communication is key," said Kristie Macrakis, professor in the School of History, Technology, and Society, on the importance of invisible ink and other discreet communication methods to both spies and the general public. "The digital world has taken the ancient Greeks and just used a much fancier technology for the same principle."  Source:  The Takeaway, April 30, 2014

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