A desiccated 110-year-old lemon and a talcum power case are among the tools of spycraft that are now on display at Britain’s National Archives. MI5, Britain’s domestic intelligence agency collaborated ...
A desiccated 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London ...
Spy used pen nibs dipped in lemon to write invisible messages to his counterparts. He relayed his secrets in between lines of ...