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Louisiana officials say they identified for the first time a dangerous form of amoeba in a municipal water supply. It was found after a 4-year-old boy died of a brain infection caused by the amoeba. They say this may make it easier to diagnose cases of encephalitis with unknown causes.

Critics of the NSA's secret surveillance hoped the debate that followed Edward Snowden's leaks would prompt the NSA to rethink the operation. Instead, one of the most noticeable effects so far has been a diversion of resources away from intelligence missions toward assessing damage from the leaks.

In The Price of Inequality, Nobel Prize-winning economist Joseph Stiglitz argues that widely unequal societies don't function effectively or have stable economies. Even the rich will pay a steep price if economic inequalities continue to worsen, he says.

Republicans need to pick up four seats to win control of the U.S. Senate in November. One race they're eyeing is in North Dakota, where longtime Democratic incumbent Kent Conrad is retiring. Outside spending is already in play, and the Democratic candidate is distancing herself from President Obama.

Researchers have found traces of HIV virus in the cells of the first man who was cured of the infection with bone marrow transplants. It raises fresh questions about how to define a cure for HIV/AIDS.

Republican Gov. Scott Walker faces Milwaukee Mayor Tom Barrett in a recall election Tuesday that has attracted a lot of outside money. The attempt to remove Walker came after he successfully pushed to limit collective bargaining rights for public sector unions.

Subscription-based business models are nothing new. But right now, e-commerce subscriptions are exploding. And in some cases, companies that make a unique pitch about their product line can win customers away from large retailers like Amazon.

Obama accepted his nomination highlighting a more somber version of the hope and change he promised in 2008.

The publicly funded, privately run schools are at a crossroads. The initial goal was to experiment with alternative ways of educating children, but as charter schools spread rapidly, not all are making the intended impact.

Mitt Romney will formally accept the GOP nomination for president tonight. The trick for his acceptance speech will be finding applause lines that fire up the base, without turning off moderate and independent voters.