Two freshwater species of mussels native to southern Russia, are now in more than 600 bodies of water in 27 states. Jim Kennedy, professor of biological science at the University of North Texas, joins... more 
Two freshwater species of mussels native to southern Russia, are now in more than 600 bodies of water in 27 states. Jim Kennedy, professor of biological science at the University of North Texas, joins "CBS This Morning: Saturday" to explain the impact of these creatures. less 
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Sat, Aug 10, 2013 10:10 AM EDT