UK scientists create the 'world's smallest Christmas card'
Scientists at UK's National Physical Laboratory claimed to have created the world's smallest Christmas card, measuring 15x20 micrometres in dimensions. The card is so small that 200 million of these cards could fit into a standard postage stamp. The card, made from platinum-coated silicon nitride and illustrated using a focused ion beam, features a snowman above the words "Season's Greetings".