At the core

A few years ago, chemical analyses of deep sea muds that used a new X-ray technology were able to help explain why the Classic Mayan civilization collapsed more than a thousand years ago.

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<p><a href="http://www.physorg.com/news77906585.html">At the core</a></p> <p>A few years ago, chemical analyses of deep sea muds that used a new X-ray technology were able to help explain why the Classic Mayan civilization collapsed more than a thousand years ago.</p>