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Scientific American In the centuries before envelopes, “letterlocking” secured a message’s information Print Computer-generated unfolding animation of a sealed letter from 17th-century Europe. The physical letter itself has never been opened. Credit: Unlocking History Research Group Advertisement In 1697 a legal professional in the French city of Lille wrote to his cousin in the Netherlands to request a relative’s death certificate, possibly in order to finalize an inheritance. He folded and sealed his mundane missive so it would hold together without an envelope and mailed it off to the Hague. For some reason, it never reached its recipient and remains sealed today. Yet a team of historians and scientists have still read it thanks to high-resolution imaging and a “virtual unfolding” algorithm.

City ofUnited kingdomPaula findlenJana dambrogioHolly jacksonDaniel starza smithAmanda ghassaeiJohn donneQueen elizabethFrancis walsinghamKing college londonNature communicationsQueen mary university of londonMassachusetts institute of technology librariesStanford universityMassachusetts institute