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Did you know that you can store information in a way that it is right in front of you, yet you cannot see it unless being under specific light conditions? Nowadays there is smart technology, which allows valuable, written information to be protected, using materials that reveal the message only when placed under polarised light. Dr Young Min Song and his team at Gwangju Institute of Science and Technology, Korea, pioneered a great advancement on the materials used for covert polarisation display, showing that besides smart, they can also be scalable and widely applicable!

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