People once folded their correspondence in intricate ways, known as “letterlocking,” to keep out snoops. A fancy new imaging technique sees right through it. 

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People once folded their correspondence in intricate ways, known as “letterlocking,” to keep out snoops. A fancy new imaging technique sees right through it. Learn about your ad choices: dovetail.prx.org/ad-choices

People once folded their correspondence in intricate ways, known as “letterlocking,” to keep out snoops. A fancy new imaging technique sees right through it. 

Learn about your ad choices: <a href="https://dovetail.prx.org/ad-choices" rel="noopener noreferrer">dovetail.prx.org/ad-choices</a>

Sleuths Read Old Booby-Trapped Letters Without Opening Them

Get in-depth coverage of current and future trends in technology, and how they are shaping business, entertainment, communications, science, politics, and society.

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Get in-depth coverage of current and future trends in technology, and how they are shaping business, entertainment, communications, science, politics, and society.

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Sleuths Read Old Booby-Trapped Letters Without Opening Them

Sleuths Read Old Booby-Trapped Letters Without Opening Them

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