Empty shelves where eggs should be at a Whole Foods Market in Washington, D.C. The store blames increased demand for organic eggs. Dan Charles/NPR hide caption

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A corn field is shrouded in mist at sunrise in rural Springfield, Neb. Nati Harnik/AP hide caption

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President Obama and Agriculture Secretary Tom Vilsack (second from right) inspect drought-damaged corn on the McIntosh farm in Missouri Valley, Iowa. Carolyn Kaster/AP hide caption

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