[Expired]Education - Intro to Structures: Bridges

Amazon.com offers the K'NEX Education - Intro to Structures: Bridges for $18.99.

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Features: introduces students to the history, function, structural design, geometry and strength of bridges, Builds 13 fully-functioning replicas of real-world structures, one at a time, Includes 207 K'NEX pieces, Building instructions and comprehensive teacher's guide CD included, For 3rd through 6th grade classrooms