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	What is ultrasound? Is it actually sound? Suzie in Norwich
	Ultrasound is sound but it's got such a high frequency that you can't hear it. It's so high and the wavelength's so small that you just can't hear it.
	May 2006

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Listen to this as part of the show: 21st May 2006 - New Planets, Harmonics and the science of Sound.
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