If you could travel back in time 41,000 years to the last ice age, your compass would point south instead of north.
That’s because for a period of a few hundred years, the Earth’s magnetic field was reversed.
These reversals have happened repeatedly over the planet’s history, sometimes lasting hundreds of thousands of years.
Read more: http://www.dailymail.co.uk/sciencetech/article-4508350/Giant-lava-lamp-inside-Earth-flip-magnetic-field.html#ixzz4hFKbOUay
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