Michael In Germany, to put a picture frame up on the wall, renters break out the hammer drill, to go through common brick walls like butter, then insert a plastic anchor in the hole and a screw, and up goes the frame, solid as a rock, forever and a day, regardless of what happens around it. Not so in America, where most houses aren't made of bricks, but built by nailing half-inch-thick slates of drywall onto wooden 2x4 studs and calling the result "house" (figure 1). You might think I'm pulling your leg here, but that's the honest truth. It's done this way mostly because it's cheap, but in the San Francisco Bay Area it's actually a safety measure, because of the constant earthquakes. Wood is flexible and bounces back, while bricks crumble and crush occupants.
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