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

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.

Sound can travel through a variety of media.

Put a string around your head, and play it! Learn about vibration, sounds, and pitch.

In this activity, learners surprise their eyes with an optical illusion involving arrows made out of pipe cleaners.

In this activity, learners examine their tongue and taste buds.

In this activity, learners try to blow up a balloon hanging inside of an empty bottle.

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

Sound changes pitch relative to how you or the source of the sound is moving. Use this simple activity developed by the Exploratorium to experience the Doppler Effect yourself!

This perception trick focuses on conflicting information to the brain...instead of trying to see two images, you're trying to get a bright spot by overlapping the image you see through two tubes.