Unusual rods get thicker when stretched

Day-to-day experience teaches us that stretching an object makes it thinner; pushing it together makes it thicker. However, there are also materials that behave contrary to our expectations: they get thicker when stretched and thinner when compressed.

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<p><a href="http://www.physorg.com/news75647411.html">Unusual rods get thicker when stretched</a></p> <p>Day-to-day experience teaches us that stretching an object makes it thinner; pushing it together makes it thicker. However, there are also materials that behave contrary to our expectations: they get thicker when stretched and thinner when compressed. </p>