Most Nancy Drew fans could tell you how to make invisible ink. But the CIA has still waited until now to lift the lid its 'secret writing' practices, revealed today in some of the oldest secret ...
Chinese scientists have created an invisible ink to keep precious information out of unwanted hands. The water-based system can be printed in seconds and, after it has been read under ultraviolet ...
BRITAIN'S security service MI5 is teaching kids as young as SEVEN how to be spies. Junior James Bonds can learn how to make invisible ink and use a secret code once employed by a real-life agent. Once ...
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