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

In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself.

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.

Learners experiment with a commercial photo-sensitive paper (Sunprint® or NaturePrint® paper). They place opaque and clear objects on the paper and expose it to bright light, observing the results.

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.

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

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

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

Learners mix a solution of luminol with hydrogen peroxide to produce a reaction that gives off blue light.

Which one of your eyes are dominant? Do they act independently or are they equally "in control?" This activity explores how your eyes work (or don't work) together.

What happens when two wave pulses meet in the middle? Send waves down a spring to watch them travel and interact.

We listen to stereo music systems, tv's, and radios because it simulates being where the sound originates.

Listen to the beat of gravity. By taking two strings with weights tied to them at different, yet uniform intervals, you can hear the uniformity (and rhythm) of gravity's accelerating pull.

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 quick activity, Dracula has a hole in his house and learners help solve the problem by using a mirror and protractor to reflect incoming light out of his house.

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

Sound can travel through a variety of media.

In this optics activity, learners use glass and water to demonstrate total internal reflection (TIR).

Play with a slinky and make transverse waves. In this simple Exploratorium Science Snack, learners will experience making waves and will learn the different parts of a wave.