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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George Osodi/AP

Michael Klare: Grappling With The Age Of 'Tough Oil'

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Queen Latifah has won multiple acting and singing awards, including a Grammy for the song "U.N.I.T.Y." from her 1993 album, Black Reign. Bryan Bedder/Getty Images hide caption

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Bryan Bedder/Getty Images

Queen Latifah: 'Put On Your Crown,' Make A Change

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Immortality Explored In 'Long For This World'

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Women take part in a 1977 demonstration in New York City demanding safe and legal abortions for all women. Peter Keegan/Stringer/Hulton Archive/Getty Images hide caption

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Peter Keegan/Stringer/Hulton Archive/Getty Images

The Rhetoric That Shaped The Abortion Debate

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A Journey Along 'Spartacus Road'

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Why Wall Street's Meltdown May Happen Again

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'Portrait Of An Addict': One Man's Rise And Fall

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A Hollywood Story In 'Everything Lovely'

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Look twice: Champion skier and skateboarder Kevin Michael Connolly goes places most people wouldn't. And most people -- unlike Connolly -- have legs. Courtesy of Kevin Michael Connolly hide caption

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Courtesy of Kevin Michael Connolly

'Double Take' Author: Skiing Hard And Staring Back

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Michael Chabon: On What 'Manhood' Means

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Dan Gottlieb hosts a mental-health call-in radio show on WHYY. In 1979, was in a near-fatal car accident that left him paralyzed from the chest down. hide caption

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A Grandfather's Message To His Autistic Grandson

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India's Diverse Faiths, As Told Through 'Nine Lives'

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Quanah Parker was the last chief of the Comanches — and the son of Cynthia Ann Parker, who was captured as a child by the Comanches. Hulton Archive/Getty Images hide caption

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Hulton Archive/Getty Images

Comanche Nation: The Rise And Fall Of An 'Empire'

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Gates' Lawyer Challenges 'The Presumption Of Guilt'

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A Palestinian tunnel-digger enters a smuggling tunnel in Rafah, along the border with Egypt in the southern Gaza Strip. Eyad Baba/AP hide caption

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Eyad Baba/AP

Israel And Gaza: A Crack In The Stalemate

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