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Diplomats from the U.S. and many other nations have walked out of the United Nations General Assembly as the Iranian president runs through a long list of what he says are crimes committed by other nations. The U.S. calls his comments "despicable."

In Africa, some ranchers shoot wildlife to keep them from eating the grass out from under their cattle. But it turns out some wildlife, like zebra, actually help cattle graze — by clearing fibrous grass stalks away and promoting the new shoot growth that cows crave.

At the close of trading, the Dow Jones industrial average was down 391.01 points, or 3.5 percent, at 10,733.83. At one point, the Dow fell 527 points. The Standard & Poor's 500 and Nasdaq composite each closed down more than 3 percent.

During a hearing Thursday on Capitol Hill, the top U.S. military officer, Adm. Mike Mullen, issued a stern warning to Pakistan over ties between that country's spy agency and groups attacking U.S. forces in Afghanistan. But it's unclear what the U.S. proposes to do in response.

The board said at a "critical moment," the company needed "renewed leadership."

A bioethicist says Rep. Michele Bachmann was not able to meet his challenge and produce evidence linking the HPV vaccine with mental retardation.

With its new sharing features that lean on companies like Spotify, Netflix and Hulu, Facebook hopes to become the social center for entertainment and media.

Cernan, the last man to step foot on the moon, said the country's space program was on a "path of decay."

As a young man in Virginia, Earl Reynolds once shined James Brown's shoes. And that chance meeting helped prod him into making a tough choice about his own future. For a while, Brown's advice even led to a rift between Reynolds and his father.

U.S. Treasury Secretary Timothy Geithner's trip to Europe last week reflected American concerns over Europe's economic woes. The Americans would like to see a swift European response, but that's a tall task when so many nations must agree on a plan.