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This is a great activity about wave interference. Learners will create their own wave machine and discover wave properties through hands-on investigation.

Investigate the interaction of liquids of different densities and experiment with wave patterns with this hands-on activity.

In this activity about light and perception, learners create and observe moire patterns.

In this activity, learners build a cuica or chirping bird using straw, string, and a bottle cap. Use this activity to explore the interplay of motion and sound.

In this physics activity (page 4 of the PDF), learners will--using nothing more than a coat hanger and some string--explore and understand sound energy and how it moves.