40: Eerie feeling? Maybe you′re just hearing things - CSMonitor.com

Monday, January 18, 2010 | Source: http://www.csmonitor.com/2003/0918/p14s02-stss.html

Human-made and natural infrasound is around us all the time. ... Some infrasound sources, such as ocean waves, can be detected thousands of miles away. ...

View the full article at http://www.csmonitor.com/2003/0918/p14s02-stss.html.

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