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STRAW WAVES - HOW TO Only two materials needed. Perfect teaching tools for demonstrating the movement of waves, and frequency.

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Bill Nye - Sound Travels in - YouTube Bill Nye's got lots of videos on youtube.

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Sound This Physics video shows how sound travels through the various states of matter, significance of Vibrations in the traveling of sound energy and the various type of sound waves. It also discusses about the measurement of sound and the concept of echo.