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In this activity, learners create a traditional Mexican noisemaker (a matraca) using cardboard, craft sticks, and a wooden dowel.

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

In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).

In this activity, learners build a figure that moves and "comes to life" when they pull its string.

In this activity, learners explore sound by constructing an instrument toy that buzzes when you swing it.

In this activity, learners construct a device that allows them to look over ledges or around corners.

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

In this activity, learners build a slide whistle using PVC pipe, bamboo skewer, and piece of foam. Construction of the instrument is relatively simple.

In this activity, learners build a musical drum using a cardboard tube, plastic wrap, and beads.

In this activity, learners explore sound by constructing a simple piano out of wood and craft sticks.