Sleuths Read Old Booby-Trapped Letters Without Opening Them

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 more about your ad choices. Visit podcastchoices.com/adchoices

Episode metadata supplied by the publisher feed · Published Mar 11, 2021

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Sleuths Read Old Booby-Trapped Letters Without Opening Them

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