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Aurora Borealis are seen in the northern U.S. only when the sun is extremely active.

The idea of exploiting the natural resources on asteroids has been around for more than a century. But a new company called Planetary Resources has the financial backing of some big names in high tech, and hopes to launch specially-designed prospecting spacecraft within two years.

Annan said there was also evidence the Assad regime had not pulled its military from cities.

Bell, the violin prodigy turned star, has taken the helm of the Academy of St. Martin in the Fields. On his first tour with the group as both music director and conductor, he plays the violin while conducting the orchestra simultaneously.

Paying for college is kind of like solving a mystery. What do four years of college really cost? Are your loans government or private? And when you graduate, how much will you really owe? Many students and parents don't have a clue.

In a new book, To Forgive Design: Understanding Failure, engineer Henry Petroski chronicles disasters from the sinking of the Titanic to the destruction of space shuttles Challenger and Columbia. Petroski discusses why these accidents are often caused by factors other than a design flaw.

Just three weeks ago, the former vice president had a heart transplant. This would be his first public appearance since then.

Turkey is closely aligned with the West, but it also depends on Iran to meet the energy demands of its growing economy. The relationship between Turkey and Iran has shown signs of strain over Syria, where Iran strongly supports the government, and Turkey wants regime change.

The history of rocket launches is filled with failure, but out of those failures came knowledge that helped lead to success, experts note. The question is whether North Korea's latest failure will put it on a successful path.

The big-screen version of The Last Airbender was a box-office disaster, panned by critics and loathed by fans of the popular TV series it was based on. Now, as NPR's Neda Ulaby reports, the original show's creators have been given the rare chance to rebuild their franchise with a new series.