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This comprehensive bundle includes four of our finest STEM products including the Force & Motion Activity Set, Simple Machines Activity Set, Magnets! Activity Set, and Sink or Float Activity Set. Explore the wonders of magnetism and engineering, why things sink and float, all 6 simple machines, and the science of "how things go" with colorful, engaging tools and hands-on activities and experiments. The perfect introduction to building key Science, Technology, Engineering, and Math skills. All sets include a comprehensive Activity Guide with reproducible materials.