Easy and fun collection of STEM projects and lessons for elementary and middle school. Made for teachers, science fairs, and weekend activities. Find more ideas on our website STEM Inventions! You can also find lesson plans, project sheets, and more resources as well. These project-based lessons focus on basic principles of physics, structural, and mechanical engineering. All projects in the collection use the same set of materials, so it's easy and cheap to buy in bulk and create many of these activities (links are provided in-lesson).