President Obama delivers a speech on national security Thursday at the National Defense University at Fort McNair in Washington. Pablo Martinez Monsivais/AP hide caption

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Obama Keeps Distance From Torture Debate, At Least For Now

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'Revolutions' Unfold Within Oil Industry

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India, China Could Soon Demand More Oil Than U.S. And Europe

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Chinese cyber-espionage is threatening U.S. economic competitiveness. Andy Wong/AP hide caption

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U.S. Turns Up Heat On Costly Commercial Cybertheft In China

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FBI Criticized For Failing To 'Connect Dots' In Boston Case

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This image from the Federal Bureau of Investigation shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. AP via FBI hide caption

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Clues Suggest Boston Suspects Took A Do-It-Yourself Approach

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Police Have Violent Confrontation With Bombing Suspects

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Two Young Men Suspected In Boston Bombing Attack

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Obama Visits Boston Service As Investigation Continues

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FBI Chastises Media For False Arrest Reports In Boston Bombing

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Soft Targets Have Concerned Security Officials For Years

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NPR's Tom Gjelten and Melissa Block discuss the story

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Venezuela's acting president, Nicolas Maduro, fist-bumps a worker of the state-run oil company, Petroleos de Venezuela, S.A., last month. Maduro faces opposition candidate Henrique Capriles in Sunday's presidential election. Whoever wins will have to tackle the legacy of Chavez's oil programs. Miraflores Presidential Press Office/AP hide caption

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Venezuela's Next Leader Faces Tough Choice On Oil Program

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South Korea conducts military exercises near the border with North Korea on Wednesday. Ahn Young-joon/AP hide caption

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U.S. Parries N. Korean Threats With A Fresh Plan

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