Invisible ink was known as "sympathetic stain" during the Revolutionary War. By any name, it was an effective spying tool.
Add Yahoo as a preferred source to see more of our stories on Google. BOSTON (AP) — The information needed to decipher the last remaining unsolved secret message embedded within a sculpture at CIA ...
BOSTON — The information needed to decipher the last remaining unsolved secret message embedded within a sculpture at CIA headquarters in Virginia sold at auction for nearly $1 million, the auction ...
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