Politics & Government

June 24, 2008 6:00 PM

No bigger than a thumbnail, yet this mussel is a huge pain

Never heard of the quagga mussel? It's becoming a major threat to water systems around the United States. Only the size of a thumbnail, it multiplies by the thousands, clogging municipal water pipes, taking food from native species and maybe even spurring the growth of bacteria that causes botulism. From the Great Lakes to southern California, researchers are struggling to find ways to fight it.

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