In this Aug. 30, 2010 photo, Sandra Nierzwicki-Bauer, director of the Darrin Freshwater Institute, holds samples of Asian clams found in Lake George, in Bolton Landing, N.Y. She leads a team of scientists studying invasive Asian clams in Lake George. Scientists consider the clams arrival a stroke of bad luck that could cause ecological and economic harm. They hope to smother the rapidly reproducing mollusks before they spread. (AP Photo/Mary Esch)
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