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These three short activities challenge groups to fit objects through paper and index cards: "Slots" presents the challenge for one learner to figure out which objects fit through a hole cut by another

In this engineering activity, learners construct sturdy geodesic structures out of gumdrops and toothpicks. Use this activity to explore engineering principles as well as sturdy shapes and triangles.

In this engineering activity, learners explore simple machines and then build cardboard automata using cams.

In this activity, challenge learners to design a roller coaster ride for a marble using cardboard and other simple materials.