Can’t Read This Headline? It’s Written in Invisible Ink
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Think inconspicuous ink is children’ stuff? Science historian Kristie Macrakis’ new book Prisoners, Lovers, & Spies: The Story of unnoticeable Ink from Herodotus to al-Qaeda tells a unusual tale. Macrakis argues that for prisoners, lovers, and spies all through
history, communicating secretly was a substance of being and killing. She reveals the secrets of unnoticeable penning, from the smooth (lemon juice) to the compound (microdots).

Learn further at http://scifri.me/1lIgFTe.

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