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Children play on a Nigerian oil-flow station in 2007. Nigeria, a major oil source for the United States, is riddled with ancient pipes and constant spills. That, plus the geopolitical challenges involved, is why much of Nigeria's crude is the kind of "tough oil" that author Michael Klare describes. George Osodi/AP hide caption

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Plaquemines Parish coastal zone director P.J. Hahn lifts an oil-covered pelican, which was stuck in oil at Queen Bess Island in Barataria Bay, just off the Gulf of Mexico, in early June. Gerald Herbert/AP Photo hide caption

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Saturday

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Food writer Bee Wilson says that babies are most open to trying new flavors between the ages of 4 and 7 months. Duane Ellison/iStock hide caption

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Food writer Bee Wilson says that babies are most open to trying new flavors between the ages of 4 and 7 months. Duane Ellison/iStock hide caption

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