Mystery booms: The source of a worldwide sonic enigma

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Source: http://feeds.newscientist.com/c/749/f/10897/s/1cdfc88d/l/0L0Snewscientist0N0Carticle0Cmg213285220B30A0A0Emystery0Ebooms0Ethe0Esource0Eof0Ea0Eworldwide0Esonic0Eenigma0Bhtml0DDCMP0FOTC0Erss0Gnsref0Fonline0Enews/story01.htm

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