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Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.

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

In this four-part activity, learners explore light and sound through a variety of hands-on investigations.

In this optics activity, learners discover that not all shadows are black. Learners explore human color perception by using colored lights to make additive color mixtures.