The oldest secret documents in the CIA's treasure-trove have been cracked open finally. Believed to be the only remaining classified WWI documents, the six files have revealed all manner of espionage message tricks—including the recipe for German invisible ink.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/mwD9do9RguQ/the-spy-secrets-of-the-last-unsealed-wwi-files
Sophia Bush Stacy Keibler Summer Altice Summer Glau
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