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In this optics activity, learners discover how they can make glass objects "disappear." Learners submerge glass objects like stirring rods into a beaker of Wesson™ oil to explore how the principles of

In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.

In this quick activity/demonstration (5th on the page), learners explore depth perception.

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.