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"Drywall, like all building materials, has its own characteristics and problems. As the wood studs age and shrink, nails and screws loosen and pop out of the wood. Learn how to fix popped drywall nails."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/how-to-fix-popped-nails.htm>