"As a drywall finisher, I wanted to create a new drywall gun that would eliminate the need for a separate stud finder," said an inventor, from Williamson, N.Y., "so I invented the STUD GUN. My design ...

While there is no such thing as a perfect building material, drywall comes pretty close. For one thing, it's dirt cheap, costing about $7 for a 1/2-in.-thick 4 x 8 panel. It's also DIY friendly--about ...