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In this optics activity, learners use water to make a coin "appear" and "disappear." Use this activity to demonstrate how light refracts and introduce light as waves.

This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

Align four color transparencies, each one a single color (cyan, magenta, yellow, and black), and see a beautiful full color image.

Create an illusion where it appears that your hand has a hole in it. You'll see the results from when one eye gets conflicting information.

This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

If you had a long tube with a 5 millimeter wide slit, would you see the entire Golden Gate Bridge?

In this activity, learners conduct a simple test to find their blind spot.

In this quick activity, learners practice locating a constellation in a map of very dark skies.

In this optics activity, learners use paint thinner to make a small jar seem to disappear inside a larger jar.

In this activity, learners create a "mini sky" in a glass of water in a dark room.

In this activity about vision and optical illusions, learners conduct a simple test to demonstrate how our eyes create "afterimages." Learners stare at a black cardboard bat for at least 30 seconds an

In this activity about scale, learners investigate the world of the very small by cutting a 28 centimeter strip of paper in half as many times as they can.