Scientists have developed a method of turning paper into keyboards that can convert notebooks into music players and make food packaging interactive. Engineers from Purdue University made the interfaces repellent to moisture, liquid stains, and dust by coating paper with highly-fluorinated molecules. They then used this coating to print multiple layers of circuits onto the paper without smearing ink across the pages. The interfaces are powered by vertical pressure sensors that harvest energy through contact with the user — which means they don’t need an external battery. “This is the first time a self-powered paper-based electronic device is demonstrated,” said Ramses Martinez, an…

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