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[Phys-l] Earth's magnetic field

Saw this article online. Tampa airport had to close because Earth's
magnetic pole is shifting. Never knew of airports closing because of this.
Has this happen at other airports?

http://news.yahoo.com/s/yblog_thelookout/20110107/sc_yblog_thelookout/florida-temporarily-closes-runway-due-to-magnetic-pole-shifting&vm=r