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Arts, Culture & Media
PRI's The World
April 29, 2014 · 7:30 PM EDT
Listen to the story.
Hundred year old lemon found in the British Archives. Many spies were caught because they used lemon juice.
Women working in an SW detection lab.
Nickolay Hansen, pictured above, hid invisible ink in his tooth.
In Arts, Culture & MediaSideways GlanceThe World in Words.
Tagged: Kristie Macrakisinvisible inkStasi.
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