Eye-catching holograms on credit cards thwart would-be forgers. Using light to enhance security in a new way, researchers at the Massachusetts Institute of Technology (MIT) have devised a cheap, translucent material to be embedded in credit cards, identity cards, and other possessions. Built-in windows made of the material would endow items with unique identifiers that are almost impossible to tamper with or copy, says co-inventor Ravikanth S.
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