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Cedar Rapids, Iowa 52401
PHOTOS: Students compete in bridge building contest
A truss bridge model fails from the weight it was supporting during a competition to determine whose bridge was the most efficient at supporting weight at the Marion Home School Assistance Program on Tuesday, March 16, 2010, in Marion. A bridge's efficiency is determined by dividing the failure weight by the bridge's weight. (Jim Slosiarek/The Gazette)
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