Season's micro-greetings: Scientists claim smallest Christmas card

The card, created by the National Physical Laboratory (NPL), the U.K.'s national measurement standards laboratory, measures 15 x 20 micrometers.The card's cover features an etching of a snowman, above the words "seasons greetings," as well as a seasonal message inside.One of the card's inventors, NPL's Dr David Cox, who created the card along with his colleague Dr Kin Mingard, said the technology used in its making had more practical uses.