What makes Mars magnetic?

So how have these rocks hung onto their magnetic directions and what do they tell us about Mars? Strangely, the answer to these questions might be sitting here on Earth.

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<p><a href="http://www.physorg.com/news105965930.html">What makes Mars magnetic?</a></p> <p>So how have these rocks hung onto their magnetic directions and what do they tell us about Mars? Strangely, the answer to these questions might be sitting here on Earth.</p>