The National Geographic 75-Piece Magnetic Marble Run STEM Building Set offers an exciting way to build marble mazes with innovative magnetic connectors. Children and adults can build, create, and explore engineering and physics on any magnetic surface. This STEM marble run set includes 28 magnetic connectors, 14 track pieces, 17 trick pieces (2 funnels, 1 around, 2 flex, 2 poles, 2 simple spinners, 1 spinner pro, 1 bell, 1 switch, 1 catapult, 4 U-turns), 15 marbles, a storage bag, detailed instructions, and a fact-filled learning guide. Explore physics and engineering by creating chain reactions and intricate paths for your marbles on any vertical magnetic surface. Experiment with different track and trick pieces to build, adjust, and create new pathways and obstacles. The set provides a Rube Goldberg machine-style of play that is fun and satisfying, fostering collaborative play. The magnetic connectors are sturdy yet easy to move, and the set comes with a storage bag to keep pieces secure. It's designed to challenge kids to engineer creatively, offering infinite possibilities with various track and trick pieces like straight, curved, corner, spinning, flipping, and catapulting elements. The set also includes a full-color learning guide with 5 building challenges to teach the science behind the fun, promoting creativity, independence, problem-solving, confidence, and critical thinking skills. A portion of the proceeds supports the National Geographic Society.