Grimes Sweetcorn worker Paulette Vandyke waits to sell fresh corn in Grimes, Iowa. The drought has pushed the price of corn per bushel up nearly 40 percent in the past two months. Justin Sullivan/Getty Images hide caption

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Drought has taken a toll on corn this year, and as a result, a growing number of ethanol plants have closed. Saul Loeb /AFP/Getty Images hide caption

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Two men from northwestern Missouri became ill after tick bites infected them with a previously unknown virus. hide caption

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People walk in the storm surge from Hurricane Isaac along Lake Pontchartrain in New Orleans. Isaac was later downgraded to a tropical storm as it continued to grind its way through the Gulf Coast, dropping torrential rain and generating dangerous storm surges. Gerald Herbert/AP hide caption

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A Beechcraft airplane sprays insecticide over Dallas early Monday morning to curb the spread of West Nile virus. LM Otero/AP hide caption

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Seals swim among the docked boats at Chatham's fish pier, waiting for a free meal. Curt Nickisch for NPR hide caption

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Ted and Gale Franklin live in Leroy Township, Pa., where people have been dealing with flammable gas puddles and tainted well water. Becky Lettenberger/NPR hide caption

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Heath Powers, a project manager at the Los Alamos National Laboratory's "tree torture" lab, climbs through a maze of wiring outside a tree chamber. David Gilkey/NPR hide caption

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William Armstrong, fire manager for the Santa Fe National Forest service, says lush forests can be a "plague." David Gilkey/NPR hide caption

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