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could this be what geo-magnetic reversal is?
Saturday, 7 April 2012 11:41 pmA 15 second video -- it takes only a minute or so to download, even on a slow internet connection like mine.
http://www.youtube.com/watch?v=L2o9eBl_Gzw
http://www.youtube.com/watch?v=L2o9eBl_Gzw