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Source: 2011 slayings of Tamerlan Tsarnaev's friend, 2 others revisited

The slaying of one of Tamerlan Tsarnaev's best friends in September 2011 is now being reviewed by a "wider group of eyes,"a source close to the Boston bombing investigation tells CNN.

Justice Department files charges against Lance Armstrong

The Justice Department late Tuesday formally filed its case against Lance Armstrong and his company Tailwind Sports for millions of dollars which the U.S. Postal Service had spent to sponsor the cycling team.

Boston bombing suspect's condition upgraded to fair

The medical condition of hospitalized Boston Marathon attack suspect Dzhokhar Tsarnaev, has been upgraded to fair, the U.S. attorney's office in Massachusetts said via Twitter on Tuesday.

'Smart guns' could be next step in gun control

A proposal to expand background checks failed in Washington, but several entrepreneurs say they have a different answer to curbing gun violence.

Millions eligible for Obamacare subsidies, but most don't know it

NEW YORK (CNNMoney) -- Nearly 26 million Americans could be eligible for health insurance subsidies next year, but most don't know it. That's because relatively few people are familiar with provisions in the Affordable Care Act, aka "Obamacare," t

Researchers: Elderly more at risk from H7N9

Research into the H7N9 virus suggests the risk of contracting serious illness rises with age and that more people may be infected than the 105 cases reported, according to a study by the Hong Kong University. Benjamin Cowling, associate professor

Spain arrests 2 men suspected of al Qaeda group links

MADRID (CNN) -- Spanish police arrested two suspected terrorists with apparent links to an al Qaeda-affiliated group Tuesday but said they had no indication of an imminent attack. The Interior Ministry identified the suspects as Nou Mediouni, 23,

Oil, money and politics; EPA snags Keystone XL pipeline

The politics of oil and ecology have put President Obama between a rock and hard place, as he faces a decision on whether or not to permit construction of a new pipeline. The squeeze just got tighter with a new, negative environmental assessment.

5 key questions in Boston bombing probe

The capture of the surviving Boston Marathon bombing suspect last Friday ended the city's nightmare. But for investigators, a huge task lies ahead. They "have a million questions, and those questions need to be answered," Massachusetts Gov.