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X-Rays Help Scientists Read ‘Letterlocked’ Renaissance Mail
In July 1697, Jacques Sennacques of Lille, France, scribbled off a missive to his merchant cousin, Pierre le Pers, in The Hague. The subject of discussion was a death certificate for their relative, a topic which the cousins had discussed previously but le Pers had neglected to follow up on. The letter was the Renaissance…
