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Chinese Fleet Sails Into Contested Waters as US Aircraft Carrier Approaches Melinda French Gates explains why her new book ...

Steve: That's John Nagy, author of the new book Invisible Ink: Spycraft of the American Revolution. He spoke last month at the famous Revolutionary War hangout at the Fraunces Tavern in Lower ...

The lemon Karl Muller used for writing in invisible ink was an exhibit at his trial in ... He pierced lemons with a pen nib to extract the juice and insert secret writing in innocent-looking ...

"I did one with disappearing ink with this incredible tattoo artist ... As a matter of fact, I even forgot that I did it because it's invisible." The tattoo can be revealed "with a certain light ...

used pen nibs dipped in lemon to write invisible messages to his counterparts. He relayed his secrets in between lines of regular ink in what appeared to be otherwise unremarkable letters.