Mystery booms: The source of a worldwide sonic enigma

Mystery booms: The source of a worldwide sonic enigma

New Scientist, 23 February 2012
www.newscientist.com/article/mg21328522.300-mystery-booms-the-source-of-a-worldwide-sonic-enigma.html

Every so often, a loud booming noise is heard from over the horizon without any obvious explanation. What on Earth could the culprit be?

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