when i go running i always have varying music on my ipod with me. yesterday it was the soundtrack of mission impossible 2, and i have to tell you this is a kick ass song for going a bit faster :)
Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations
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