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Bacteria-laced algae are invading freshwater streams across the globe

In the small, freshwater streams of South Dakota, a horrible menace is creeping along the rockbeds. Known as rock snot, it's a form of algae that clings to rocks and spreads rapidly until it takes over the entire ecosystem of the stream, often killing off local plants and microbes. The stuff has spread from North… » 6/07/11 5:00pm 6/07/11 5:00pm