279291 external_news 1393431283 1475893619 Kristie Macrakis, a professor in the School of History, Technology, and Society, has been featured as a guest blogger on Yale University Press, uncovering the history and use of secret writing forms. In celebration of Valentine's Day, the special guest post exposed a multitidue of methods used through history for love letters and other discrete communication, including the use of substances such as milk, lemon juice, and cobalt chloride.

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