kids build custom marble racetracks while discovering engineering fundamentals with the National Geographic 50 Piece Glow-in-the-Dark Marble Run. The 41 track pieces fit together in endless new combinations, and an included learning guide informs their designs with lessons on gravity and motion. The 8 marbles glow in the dark while they streak and spin toward the finish line. National Geographic 50 Piece Glow-in-the-Dark Marble Run Blue - Outdoor Games at Academy Sports
