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Stereoscope
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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

Two Washers
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In this activity, learners create a mind and math puzzle that requires a three-dimensional solution.

Topological Puzzles
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In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

Games of Chance and Brains
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In this activity, learners build and play three math games. In the first game, called "Switcheroo," learners place marbles in holes 1 through 4 and 7 through 10.