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In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.

This activity (9th activity on the page) about hearing demonstrates to learners the importance of having two ears.

In this activity (11th activity on the page), learners use pennies to test their hearing acuity.

In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.