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

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

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.

In this activity, learners build a musical drum using a cardboard tube, plastic wrap, and beads.