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In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

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.

In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.

This fun hands-on astronomy activity uses a variety of simple props to help learners understand why they see what they see in a telescope.