It wouldn't look great on your mantelpiece. But nanotechnology experts have unveiled 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.
'The card is 200 micro-metres wide by 290 micro-metres tall. To put that into some sort of perspective, a micro-metre is a millionth of a metre; the width of a human hair is about 100 micro-metres.The university's school of engineering drew up the design to highlight its 'world-leading' nanotechnology expertise. A total of 8,276 of the cards could be placed on an area the size of a stamp. Professor David Cumming and Dr Qin Chen etched the Christmas tree image on to a minute piece of glass.