The longest river in China, the Yangtze River, turned a deep blood red a few weeks ago and officials said they do not know why.  Residents first noticed the change on September 6, 2012. 

Environmental officials have said they suspect pollution, but that was not determined.  Emily Stanley, a professor of limnology at the University of Wisconsin, said that a natural explanation for red water is color-producing microorganisms, but that can likely be ruled out.  "When water turns red, the thing a...
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