Washable circuits make great bulletproof vests

For all the buzz around wearable technology, there remains a minor problem: What do you do when they get dirty? Now, researchers have figured out a solution, New Scientist reports: a “fabric circuit board” made of prestretched yarn knitted with polymer-coated copper fibers. The textile can stretch, bend, and most importantly, undergo 30 washes while remaining conductive, the team reports online this week in the Proceedings of the Royal Society A. The researchers suggest the material could be used to make smart bulletproof vests that send a radio message when a wearer gets shot.

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