EMBARGOED TO 0001 THURSDAY DECEMBER 23
Handout photo issued by the University of Glasgow of a Christmas card so small that more than 8,000 of them could fit on a first-class stamp. The card produced by the University of Glasgow, said to be the smallest in the world, is invisible to the naked eye. PRESS ASSOCIATION Photo. Issue date: Thursday December 23, 2010. See PA story TECHNOLOGY Card. Photo credit should read: University of Glasgow/PA Wire