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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'

In this story time program, young learners listen to the Dr.