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In this activity, learners use cardboard bases and track tubes to make a ball run to explore the properties of mass, force, and motion.

In this tabletop activity (on pages 32-40), learners make Möbius strips -- 3D surfaces with only one side.

In this activity (on pages 55-66 of PDF), learners fold paper into origami shapes and then combine several identical shapes into a three-dimensional structure.