New York Times: The Ohio River, transformed by mining and industrial waste and sewage overflows into the nations most polluted major waterway, has a new and unexpected tormentor this fall: carpets of poisonous algae. Pads of toxic blue-green algae have speckled nearly two-thirds of the 981-mile river in the last five weeks, experts say, in an outbreak that has curbed boating, put water utilities on alert and driven the rivers few hardy swimmers back to shore. The only other recorded toxic algae bloom, in 2008,...