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Season’s micro-greetings

Scientists create world’s smallest Christmas card – 200million fit on a stamp!


BRITISH scientists have created what they believe is the world’s smallest Christmas card, a seasonal greeting so tiny more than 200 million of them could fit on to a standard postage stamp.

Reuters reported that the card, created by the National Physical Laboratory, the UK’s national measurement standards laboratory, measures 15x20 micrometres – a micrometre is one millionth of a metre – and has to be held by tiny tweezers to be photographed.
Made from platinum-coated silicon nitride, a focused ion beam was used to illustrate an etching of a snowman on the front, above the words “seasons greetings”, as well as a seasonal message inside.
NPL said the previous smallest Christmas card measured 200x209 micrometres, making their effort more than 100 times smaller, although the technology has more practical uses according to
Dr David Cox, who created the card with colleague Dr Kin Mingard.
Dr Cox said: “We’re using the tools that created the card to accurately measure the thickness of extremely small features in materials, helping to unlock new battery and semiconductor technologies. It’s a genuinely exciting development.”

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