Presents projects for constructing and testing a variety of structures, including bridges, domes, and collapsible structures, and encourages readers to design their own

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Gr 3-7-These books achieve their stated goal of involving readers in "designing and making their own working technology projects, using readily available salvaged or cheap materials" through explanations of basic concepts that are adaptable to a number of projects. Build It! features ideas for bridges, domes, structures that collapse, and pop-ups. Gear Up! explains the science behind machines such as pulleys, levers, crankshafts, gear wheels, and conveyor belts. Shape It! introduces several kinds of craft activities with molding materials, including salt dough, plaster, air-drying clay, and edible materials like cookie dough. Zap It! includes electric circuits, pressure pads, and different kinds of switches. Some of these ventures require less familiar supplies like "capacitors" and a "reed switch," which are clearly pictured, though no suggestions are given for where they might be purchased. Step-by-step directions with clear, colorful graphics and a list of materials needed accompany each activity. A small, cropped color photo often accompanies the idea. Suggestions for ways to expand on the projects are included. The format is clear and consistent throughout the series. The projects and topics outlined take some time and attention, and though they all have specific directions for getting started, readers are encouraged to use their creativity to adapt the ideas to original projects and inventions.-Marilyn Long Graham, Lee County Library System, Estero, FL

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