Inexpensive engineering and construction techniques could have kept standing many of the structures leveled in Oklahoma after Monday's tornado, according to Andrew Graettinger, a civil engineer at the University of Alabama. Hurricane clips and straps to keep walls attached to roofs and foundations cost about one dollar a piece and are used extensively on the Gulf Coast, and using them in Oklahoma "would be a huge step forward," Graettinger said. "The next step is to optimize some [building-strengthening techniques] with more creative and exotic materials, which will come in the future," he added.

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