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The nature of war has changed, and so has the president's purview. The country increasingly relies on elite special forces, rather than armies, and drone technology to target its enemies. How those operations are authorized has also shifted — it's more covert and less defined.

A wave of kidnappings and an alleged bombing plot — both linked to the uprising in neighboring Syria — are shaking Lebanon's precarious sectarian balance. But the foreign patrons of Lebanon's political factions are preoccupied with Syria and appear unwilling to bankroll a proxy war in Lebanon, at least for now.

It's been more than a week since the Mars rover Curiosity made its successful landing on the Red Planet. Curiosity is by far the most technologically advanced rover to reach the planet's surface. David Greene talks to astrophysicist Neal DeGrasse Tyson, director of the Hayden Planetarium in New York City, about Curiosity's two-year visit to Mars.

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

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.

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.

Republican presidential candidate Mitt Romney paid about $3 million in federal income taxes in 2010. Romney's tax returns show most of his $21.7 million income came from his investments. The former Mass. governor has been under pressure in recent weeks to release his tax returns. Some media organizations received an advanced copy of the candidate's return.

Critics accuse the prime minister and his conservative Fidesz party of pushing Hungary backward. The European Union says aspects of the country's new constitution violate EU law and treaties. But a government spokesman says the ruling party is merely fulfilling its election mandate.

GOP presidential candidate Mitt Romney has developed a polished stump speech. During his events, Romney has campaigned as if President Obama is his only opponent. That tactic has forced his Republican rivals to try anything they can to knock him out of front-runner status.

While GOP presidential candidate Mitt Romney savored his second consecutive win in the Republican nominating process, those who finished behind him in New Hampshire also continued on to South Carolina. They are hoping that it is in the Palmetto state where they can get his campaign to to stumble before it becomes unstoppable.