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Videos appear to show security forces using live ammunition, which Iran's government has denied. The demonstrations erupted after Iran acknowledged that it accidentally shot down a passenger plane.

In 2011, Chrysler recovered from bankruptcy by redefining itself as a better, more luxurious car company and paying off nearly $8 billion in bailout loans. To top it all off, Chrysler sales are up 25 percent this year, about twice the industry average.

Much has been made of the unusual volatility of the GOP race this year, with candidates taking turns in the front-runner spot in Iowa. But with more outside money and a reliance on social media, the run-up to this election season's Iowa caucuses has been different in other ways as well.

American swimmer Ryan Lochte won the gold medal in the men's 400-meter individual medley Saturday, beating Michael Phelps and the rest of a talented field at the London 2012 Olympics.

This week Las Vegas saw the world's largest hacking party — and it was all legal. The gathering was designed to bring together cybersecurity experts — including the top hackers in the business — to expose vulnerabilities before criminals uncover them. The big focus this year was on mobile phones.

American gymnast Gabby Douglas has won her second Olympic gold medal of the London Summer Games, winning the individual all-around event to match her performance anchoring the U.S. team's gold-medal performance earlier this week. Teammate Aly Raisman finished fourth.

Gymnast Aliya Mustafina of Russia has won the 2012 Olympic gold medal in the uneven bars, standing atop the podium in a highly competitive event that also featured American star Gabby Douglas, defending medalist He Kexin of China, and British favorite Beth Tweddle.

When Sandy hit the Eastern Seaboard, three men from Chicago raised money for food and then drove to NYC to feed storm victims. NPR's Richard Gonzales sent an audio postcard from Howard Beach, N.Y.

Nailah Lymus, a 27-year-old aspiring designer and Muslim woman, had her first runway show during New York City's Fashion Week. Her clothing line, Amirah Creations, aims for modesty, but is also "transitional" in catering to both Muslims and non-Muslims.

He fills the positions that opened earlier this year when controversies led to Vivian Schiller's departure. Today on Talk of the Nation, and later on Twitter, Knell takes questions.