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Eating a battery may no longer require a trip to the emergency room,
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.
With squishy silicone and tunneling electrons, researchers have created coated batteries that prevent unwanted zaps. The quantum-inspired coating works by switching from being a conductor —which it is when squeezed into an electronic gadget’s battery housing —to an insulator when it’s taken out and,
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, accidentally gulped. The finding,
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, appearing November 3 in the Proceedings of the National Academy of Sciences, could help avert the estimated 5,000 hospital visits due to battery ingestion each year in the United States.
“Children love to place foreign objects into their mouth, nose and ears,” says pediatric surgeon Albert Park of the University of Utah in Salt Lake City. Button batteries, the kind used in the study, are particularly dangerous, Park says.
Named for their size and shape, button batteries are found in watches, toys and other common doodads. Their small size makes them easy to swallow but they can get stuck in a person’s throat, where they can cause injury within a few hours. In the digestive tract, batteries can leak electrical current that blasts water molecules apart and causes damage similar to chemical burns.
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