The fingerprint of paper
At a time of rising concern about terrorism, British scientists last week announced that they had discovered a relatively inexpensive and surprisingly powerful new way to defeat forgers attempting to fake birth certificates, passports, and other documents.
The scientists built a laser scanner that sweeps across the surface of paper, cardboard, or plastic, recording all of the unique microscopic imperfections that are a natural part of manufacturing such materials.
By Gareth Cook at Boston.com
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