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        3-8

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        Sound and Solids: Stereo Hangers

        Though air is the most common medium through which we hear sound, the vibrations that cause sound are transmitted through other substances as well. Watch -- and listen -- closely as cast members from ZOOM demonstrate that solid objects actually conduct sound waves more efficiently than air does. All it takes is a metal hanger and some string.

        This video is available in both English and Spanish audio, along with corresponding closed captions.

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