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The National Institutes of Health has approved requests for waivers from a moratorium on experiments that aim to make the virus that causes Middle East respiratory syndrome more infectious in mice.

The White House won't confirm North Korea is behind the attack, citing an ongoing investigation. Nevertheless, it is mulling over its options.

Many feel the president has caved to the Castro government and given away much more than it will get for scaling back the embargo.

President Obama says the U.S. and Cuba will normalize relations, which were severed in 1961. Here are images that highlight the decades of tense relations.

The decision to normalize relations is driving all kinds of speculation about American food companies opening up shop in Cuba. But analysts say: Don't expect to see McDonald's there anytime soon.

Cuba is one of the least connected countries on Earth, with 5 percent of residents online. But it could become the Caribbean's largest market if the Castros open the nation up to the Internet.

Marine scientists plumbing the deepest part of the ocean sent microphones and collection probes baited with chicken to the bottom of a trench near Guam. Now they watch, wait ... and listen.

Walter Keane made his name with wistful paintings of big-eyed children — paintings actually done by his wife. Tim Burton directs and Amy Adams stars in Big Eyes, a new movie about the Keanes.

Part of the deal for the return of American Alan Gross from Cuba involved the release of a Cuban man who had served as a spy for the U.S. He's said to have provided info about Cuban spies in the U.S.

Also: Pakistan says troops killed dozens of militants following this week's school shooting; utilities will clean up coal ash in South Carolina; and Stephen Colbert signs off on the "Colbert Report".