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A routine laser-writing technique has been used to create sheets of graphene on the surface of a DVD. The work was done by researchers in the US, who then joined the sheets together to make electrochemical capacitors (or supercapacitors). The devices can store as much energy as a conventional battery but can be charged 100–1000 times faster. According to the researchers, the capacitors are completely flexible and robust, which makes them ideal energy-storage systems for flexible and portable electronics.