Zippers are a part of many pieces of gear. From our jackets to our tents and backpacks, having a functional zipper can keep us warm, dry, and all of our gear contained. What happens when that zipper ...

The zipper keeps everything from jeans and jackets to duffel bags and lunch boxes closed tight. Still, for all its simple utility, a fastener that won’t budge has caused frustration in nearly everyone ...

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