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July 19 2014

Waste paper turned into a super-spongy battery


GOT an overflowing wastepaper basket? Now there's a way to use unwanted printouts to store energy.

Traditional batteries use chemical reactions to store large amounts of energy, but they take time to charge. Capacitors store it in an electric field, which means they can charge and release energy quickly. But they can only hold small amounts at a time.

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