This seems like a good(bad) article to start this thread:
	
	
		
			
				
					
						
					
				
			
			
				
					
						
							
						
					
					www.scientificamerican.com
				
			
		
	
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				Why Are Alaska's Rivers Turning Orange?
Streams in Alaska are turning orange with iron and sulfuric acid. Scientists are trying to figure out why
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