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In this activity, learners use pop-beads to understand the characteristics and properties of polymer chains.

In this activity (posted on March 14, 2011), learners follow the steps to construct a camera projector to explore lenses and refraction.

In this activity, learners explore the many uses of periscopes and how this simple device was designed and is used in many applications.

In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary.

In this activity, learners make optical fibers out of strips of gelatin.