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Conjuring a Solitary Sound Wave

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Science  10 Dec 1999:
Vol. 286, Issue 5447, pp. 2062
DOI: 10.1126/science.286.5447.2062

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Spotted 150 years ago on the water of a canal and now routinely generated in light-carrying fibers, the solitary, long-lasting waves called solitons have now been seen in yet another medium: sound. In the 15 November Physical Review Letters, a team of researchers in Japan describes how they produced acoustic solitary waves by altering the propagation of sound through an air-filled tube.