After many years of elementary science fairs, the time had come to redesign their family science event model. The displays were always well thought-out, the investigations interesting, and the science fair was always well attended. However, as the author listened to the conversations of the students as they put together their displays and the conversations with the community as they shared their work, she didn't hear what she thought she should be hearing. The conversations for the most part centered on the product itself, not the process. The time had come to try something new. The author wondered whether having the event in the middle of an investigation would encourage the conversations to focus more on science content and skills. The Engineering Is Elementary (EiE) program developed by the Museum of Science in Boston is used as a framework for the event. It ties in principles of physics, engineering, and design. In this particular unit, "Javier Builds a Bridge," students learn the basic vocabulary of bridges, the types of bridges, and spend their time testing the strength and stability of different bridges, paying attention to the materials and cost. (Contains 2 figures and 4 online resources.)