World's Tiniest Christmas Card (Invisible to the Naked Eye)
A group of nano-scientists from the University of Glasgow have created the world's smallest Christmas card, measuring in at 200 micro-meters wide by 290 micro-meters tall. (BTW, a micro-metre is a millionth of a meter, and the width of a human hair is about 100 micro-meters.)
You could fit 8,276 of the "Christmas cards" on an area the size of a first class postage stamp, making a single card invisible to the naked eye.
"Professor Cumming said: 'Our nanotechnology is among the best in the world but sometimes explaining to the public what the technology is capable of can be a bit tricky.
We decided that producing this Christmas card was a simple way to show just how accurate our technology is. The process to manufacture the card only took 30 minutes. It was very straightforward to produce as the process is highly repeatable – the design of the card took far longer than the production of the card itself.
You could fit over half a million of them onto a standard A5 Christmas card – but signing them would prove to be a bit of a challenge...'" (Read more)