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In this optics activity, demonstrate diffraction using a candle or a small bright flashlight bulb and a slide made with two pencils.

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

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

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair.

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