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President Obama's critics say the September attack in Libya and the official response reflect poorly on his administration. While they focused on TV comments by U.N. Ambassador Susan Rice, David Petraeus' resignation from the CIA complicated the debate. Some — but not all — questions were answered in closed hearings this week.

Like many other brick-and-mortar retailers, Wal-Mart is trying new strategies to serve customers whenever they want to buy. In one new experiment in four select markets, the retail giant is promising to deliver eligible items ordered online in just a few hours.

Pulitzer Prize-winning novelist Richard Russo began looking out for his mother early in life. In his new memoir, Elsewhere, Russo writes not only of his mother, but of the vanished world that shaped her. Critic Maureen Corrigan calls the book "gorgeously nuanced."

Among the athletes at the ongoing 2012 games in London are veterans of the wars in Iraq and Afghanistan. Organizers of the games say the vets raise the caliber of the competition. And injured veterans say Paralympic sports provide inspiration and the prospect of a normal, active life.

Certain sectors of the state's economy are more robust than they were four years ago, but that doesn't mean everyone's happy with the recovery. The state is sharply divided about the role of government in the economy, an issue that will be at the forefront of the upcoming presidential debate there.

Large sums of Iranian currency come into western Afghanistan every day and are exchanged for dollars, and then shipped back to Iran. There may be international sanctions against Iran, but in Afghan provinces that border the Islamic Republic, trade and money laundering are thriving.

Dark matter, which surrounds most galaxies, plays a key role in the structure of the cosmos. But we can't see it. Or can we? Recently, astronomers used a remarkable effect predicted by Einstein to spot a very tenuous bridge of dark matter linking two galaxy clusters.

Tropical Storm Isaac is expected to strengthen into a hurricane as it churns through the warm waters of the Gulf of Mexico. While its exact track is still uncertain, parts of Florida are being hit by the storms outer bands. Mississippi, Alabama and Louisiana are preparing as well.

A memo obtained by the Los Angeles Times reveals a controversial plan to put half of the city's public school kids in charter schools. Renee Montagne talks with Times education reporter Howard Blume.

Prosecutors in Sicily are tracking the smuggling networks sending migrants into Italy. One of these prosecutors, Gery Ferarra, says smugglers are organized criminal groups much like the Cosa Nostra.