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Noctilucent clouds, high-altitude clouds that appear to glow in the sky at night, usually show up in the Southern Hemisphere summer. Satellite images showed them covering Antarctica in early November.

Experts warn the multiple military probes into abuses at Abu Ghraib prison will produce much information but few answers about who is ultimately responsible. Critics worry the Bush administration hopes to bury responsibility in mountains of data. Others say documents already leaked point the finger of blame at Secretary of Defense Donald Rumsfeld. Hear NPR's Jackie Northam.

Defense Secretary Donald Rumsfeld arrived in Beijing Tuesday, where he is expected to highlight U.S. concerns that the recent growth of China's military could affect the balance of power in Asia. Washington is also concerned about China's enormous trade surplus with the United States. In the second of a four-part series, we look at the economic issues' impact.

Microbes can thrive in extreme environments, from inside fiery volcanoes to down on the bottom of the ocean. Now scientists have found a surprising number of them living in storm clouds tens of thousands of feet above the Earth. And those airborne microbes could play a role in global climate.

Democratic Sen. Tim Johnson of South Dakota was recovering from brain surgery Thursday at George Washington University Hospital. As official Washington extended good wishes for his recovery, it also puzzled over the effect that his illness may have on control of the Senate.

Often overshadowed online by his rivals, Joe Biden is holding virtual town halls and fundraisers. He's also trying to compete for TV airtime as the country is consumed by a historic crisis.

The New York Times issued a big mea culpa, and returned a Peabody award and a citation as a finalist for the Pulitzer Prize after retracting the core of its hit podcast series Caliphate.

Pianist Yael Weiss talks about her latest project, 32 Bright Clouds: Beethoven Conversations Around the World.

People are storing more and more stuff online: photos, music, documents — even books. But if you're storing your digital belongings in the cloud, you should know you're giving up some rights.

Data indicate the U.S. economy grew at an impressive 5 percent rate in the third quarter. The stock market hit another record on Tuesday. David Greene talks David Wessel of the Brookings Institution.