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With a bit of PVC, a laser, a can/cup, and a small mirror, you can make a device that visualizes you voice or any sound transmitted into the cup/can.

In this activity (4th on the page), learners conduct a series of tests to find out which of their ears is more dominant.

String Thing is an interactive online game in which learners change a virtual string's tension, length, and gauge to create different musical pitches.

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