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In this activity, learners make a stroboscope--a spinning disk with slits around the edge that you look through.

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'

This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.

In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.

In this optics activity, learners discover that when they rotate a special black and white pattern called a Benham's Disk, it produces the illusion of colored rings.