Researchers have devised a digital method to virtually unfold and read letters sealed with "letterlocking", an old practice of securing letters before envelopes (William J. Broad/New York Times)

William J. Broad / New York Times:
Researchers have devised a digital method to virtually unfold and read letters sealed with “letterlocking”, an old practice of securing letters before envelopes  —  M.I.T. researchers have devised a virtual-reality technique that lets them read old letters that were mailed …

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