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Discover how sound travels and what materials make better sound conductors. Can you hear better with your fingers in your ears? Find out with a coat hanger and some string!

Sound can travel through a variety of media.

Learners create an Incan counting device called a quipu (pronounced kee-poo).

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

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.