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The European Union was awarded the 2012 Nobel Peace Prize Friday. Kristian Berg Harpviken closely follows the Norwegian Nobel Committee's process each year. He joins guest host Celeste Headlee to discuss why he thinks the committee chose the EU.

The rise could spell good news for the economy if it means the crucial holiday shopping season will bring strong sales for retailers. It also might be an indicator of how voters will be feeling when they go to the polls.

Every August, the ozone hole begins to grow over Antarctica, reaching its maximum size by late September. But by the New Year, it's gone again. Russell Schnell, of NOAA's Earth System Research Laboratory, explains the weird forces behind the ozone hole's formation--and why, in recent years, an ozone hole has capped the Arctic too.

Ben Affleck's Argo, which is based on the declassified story of the CIA's mission to save six American diplomats trapped in Iran in 1979, is gripping, compelling and, at times, hilarious. But, as critic David Edelstein explains, the best parts of the "true" story are the parts that aren't true at all.

Rumors about the former Cuban leader's health have swirled on social media for the past day, but Fidel Castro's son says the 86-year-old is just fine, exercising and going on with his everyday activities.

Malarkey is "meaningless talk, nonsense." Vice President Biden said that's what GOP vice presidential nominee Paul Ryan was spreading. Where the word came from is a bit of a mystery.

The 2012 Nobel Prize winners were announced this week, and research on stem cells, cloning, cell receptors and quantum optics took center stage. Experts discuss how the work of this year's Nobel laureates changed our understanding of our bodies, and the world around us.

United Mine Workers officials suspect the Obama administration doesn't want to move forward on the new rules during the presidential campaign. The federal mine safety chief says the process takes time.

The evidence against the cyclist has "called into question a system and an entire era which remains stained forever," says Tour de France director Christian Prudhomme. He doesn't want to see the second-place finishers in races Armstrong won be given those titles.

NASA's space shuttle Endeavour is on its last journey. It's being towed through the streets of Los Angeles on its way to a science museum. Endeavour is expected to take two days to make the trip, providing gawkers with plenty of chances to get a glimpse.