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Since its discovery in 1911, an Egyptian iron bead has sparked debate over how it was produced — made around 3,300 BC, it predates the region's first known iron smelting by thousands of years. Now researchers say the iron was made in space, and delivered to Earth via meteorite.

He thought of himself as a priest first and foremost. But Greeley was famous for his sometimes steamy novels that also cast a critical eye at his church. Greeley was 85 and had been in poor health since suffering a brain injury in 2008.

Manssor Arbabsiar, a naturalized U.S. citizen who has lived in Texas for three decades, has been sentenced to 25 years in prison for conspiring to kill Saudi Arabia's ambassador to the United States. Last October, Arbabsiar pleaded guilty to plotting to kill the ambassador.

Law enforcement officials say the letter is similar to two that were sent to New York City Mayor Michael Bloomberg. Preliminary tests of the letter to Bloomberg turned up traces of ricin.

The 12-year U.S. military effort in Afghanistan has sought to drive out extremists and help Afghans rebuild their country. As the American forces prepare to withdraw, the focus is on practical security measures and those ambitious nation-building goals seem to be fading away.

In the more than eight years since it was written, the open-source operating system Ubuntu's "Bug #1" was seen as a rallying call: "Microsoft has a majority market share." But the entry was officially closed Thursday, as Ubuntu leader Mark Shuttleworth said things had changed since 2004.

Breakfast foods purveyor Kellogg has agreed to create a $4 million fund to settle a class-action lawsuit alleging it ran a deceptive marketing campaign for the sugary treat. The ads, which ran several years ago, claimed eating the cereal boosted kids' attentiveness by nearly 20 percent — but the science didn't back that up.

In 2004, Peter Obetz was in the middle of a divorce when he was diagnosed with esophageal cancer. He says the news was not only a wake-up call for him to change his life, but it also brought him closer to his friend Jeff Jarrett. He's been cancer-free since 2009.

Environmentalists are focusing on big corporations to prevent the destruction of rain forests cut down for paper products. With help from some unlikely characters, they've scored a success against one of the world's largest paper companies.

Pledge 51 creates applications for Nigeria's low-tech cellphones. The company thinks it could grow its business with help from foreign investors, but Nigeria's low GDP has made that difficult. If the country changes the way it calculates this figure, that could help Pledge 51 bring in new investment.