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Stumped astronomers are trying to get to the bottom of the origins of a huge cloud of gas, or nebula, recently discovered floating near the Andromeda galaxy.

The country's president and insurgents have pledged to sign a treaty, ending the Americas' longest-running conflict. But peace relies on small-town mayors, whose campaigns are often founded on favors.

The stock market tumbled again Wednesday as fears over tariffs cloud the economic outlook. Retail spending got a boost in March, however, as people tried to stock up before the tariffs took effect.

The rocket will carry supplies to the International Space Station. SpaceX hopes to land the reusable rocket on a platform in the Atlantic Ocean.

Thousands of musicians, music industry insiders and fans descend on Austin, Texas, this week for the 18th annual South by Southwest festival. At a time when employee layoffs and declining sales plague the music industry, the festival continues to grow. NPR's Rick Karr reports.

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.

In the Indian state of Meghalaya, one of the wettest places on Earth, villagers are separated by rivers and valleys. To stay connected, they coax tree roots to grow together into living bridges.

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.

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.