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root growth
trip wires
a syenite rock containing fluorescent sodalite that glows under UV light
perfect for display on shelves
Marble Run Essential 70-Piece Set Sensory root growthThis classic STEM building set invites curious builders to explore motion, gravity, and problemsolving as they assemble a customizable marble run track. With 70 interlocking pieces, you can create loops, ramps, and twists to guide marbles through exciting paths, learning about speed, angles, and causeandeffect along the way. Whether used solo or with others, this set makes physics concepts feel tangible through handson experimentation and creative