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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

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

In this activity (26th on the page), learners construct an easy-to-build device and test motor learning.

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

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

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.