Quagga mussels are clogging Hoover Dam, colonizing lakes and rivers

It took some of America's best engineers, thousands of laborers and two years of around-the-clock concrete pouring to build the 726-foot-high Hoover Dam back in the 1930s. It took less time than that for the tiny, brainless quagga mussel to bring operators of this modern wonder of the world to their knees.

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<p><a href="http://www.physorg.com/news155241159.html">Quagga mussels are clogging Hoover Dam, colonizing lakes and rivers</a></p> <p>It took some of America's best engineers, thousands of laborers and two years of around-the-clock concrete pouring to build the 726-foot-high Hoover Dam back in the 1930s. It took less time than that for the tiny, brainless quagga mussel to bring operators of this modern wonder of the world to their knees.</p>