- British scientists have created what they believe is the world’s
smallest Christmas card, a seasonal greeting so tiny that over 200
million of them could fit into a standard postage stamp.
card, created by the National Physical Laboratory (NPL), the U.K.’s
national measurement standards laboratory, measures 15 x 20 micrometers.
A micrometer is one millionth of a meter.
It is made from
platinum-coated silicon nitride, and was illustrated using a focused ion
beam. The card’s cover features an etching of a snowman, above the
words “seasons greetings,” as well as a seasonal message inside.
of the card’s inventors, NPL’s Dr David Cox, who created the card along
with his colleague Dr Kin Mingard, said the technology used in its
making had more practical uses.
“We are 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.”
said that the previous smallest Christmas card measured 200 x 209
micrometers, making their effort over 100 times smaller.