An interesting article at the BBC, covering the issue of the earth's habit of reversing polarity.
A still inexplicable phenomenon, it would be interesting to note whether there are any real dangers we face as a civilisation in the event of a complete switch of the Earth's magnetic field:
http://news.bbc.co.uk/1/hi/sci/tech/3359555.stm
A still inexplicable phenomenon, it would be interesting to note whether there are any real dangers we face as a civilisation in the event of a complete switch of the Earth's magnetic field:
http://news.bbc.co.uk/1/hi/sci/tech/3359555.stm