Video: The pond scum that can kill

You've probably seen that pesky greenish stuff floating on lakes and ponds. Usually this pond "scum" is just a nuisance. But sometimes it is a horde of cyanobacteria—also known as blue-green algae—that can blossom into ...

Ohio River's huge algae bloom a warning for water suppliers

A toxic algae outbreak that snaked more than 600 miles down the Ohio River past four states is forcing water utilities to reassess the threat from harmful algal blooms that are popping up increasingly around the nation.

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