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What does the growing income gap between the richest and poorest Americans mean for social mobility? An academic study published last week found that, contrary to popular perception, it has not gotten harder to climb the income ladder in the U.S. in the past two decades.

So you know how, if someone comes by and taps the top of your open beer bottle, a volcano of brewski will explode? Well, it turns out that the physics involved are the same as what causes an atomic bomb to form a mushroom cloud. A scientist explains how it works.

The Rupert Murdoch-owned tabloid News Of The World is facing new allegations in a phone hacking scandal that has set off a fire storm in Britain. Murdoch's top news executive at News International is under increasing pressure to resign.

Over the past three decades, the U.N. says Afghanistan's forest cover has decreased by about 50 percent — to just about 2 percent of the country's land. The main reason is the illegal harvesting and trade of timber. A visit to Kunar province, near the Pakistan border, reveals that many people, from top officials down, are involved.

Are federal prosecutors gearing up to file more big mortgage fraud cases? Bank of America was targeted recently, and JPMorgan Chase has disclosed that it is under investigation. Now that banks have returned to profitability, regulators may be more willing to take action. But time may be running out in some cases.

The corporate culture at Microsoft seems to go against the tech industry's trend toward more empowered employees. The focus on the software giant's inner workings comes as Microsoft CEO Steve Ballmer prepares to depart.

Lee Baca, 71, is facing calls to step down and not seek another term. His department is at the center of a federal probe into widespread allegations of prisoner abuse.

As congressional leaders negotiate, other lawmakers are demanding more details. Plus, Democrats are objecting to a push by some Senate Republicans to limit emergency lending rules.

The top rebel commander in northern Syria was not impressed with Secretary of State John Kerry's announcement of new direct U.S. aid to the rebels and their political leaders.

Researchers report that the U.S. ranks among the top countries at treating cancers of the brain, colon and breast. But it still lags behind most of Western Europe when it comes to drug abuse, heart disease and kidney problems.