Nanotechnologists at the University of Glasgow have produced what they believe to be the world's smallest Christmas card. The card has an image of a Christmas tree etched on a tiny piece of glass and measures 200x290 micro-metres.
Invisible to the naked eye, the card is so small that 8,276 of them could fit on an area the size of a postage stamp.
The point behind the creation of the card was to show how accurate nanotechnology is, according to the university's school of engineering.
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