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When the Soviet Union collapsed, its vast nuclear stockpile did not appear secure and the U.S. stepped in to help. Thousands of nuclear weapons have been dismantled with U.S. aid over the past two decades. But now Moscow says it's ready to pull the plug on the program.

In the Beirut cemetery where martyrs of Hezbollah are buried, new graves are appearing more frequently. It's unclear where the men were killed, but members of Syria's opposition accuse the militant group, allied with Iran, of sending fighters into Syria to aid the Bashar Assad regime. It's an accusation that Hezbollah denies. One Shiite analyst says Hezbollah members have been disappearing since last year and families have been instructed not to speak about it.

One day after Congressman Paul Ryan debated Vice President Joe Biden, Mitt Romney took to the campaign trail in Virginia and Ohio.

Robert Siegel talks with Obaida Hitto, a 25-year-old Syrian American from Texas who spent five months assisting the Free Syrian Army in Deir al-Zour on the Euphrates River, near the border of Iraq. He documented the violence in the eastern Syrian city through videos he posted on the Internet, until he was injured in a mortar attack by Bashar Assad's forces at the end of September. He is now recovering in Istanbul.

Robert Siegel talks with Mike Pesca about Major League Baseball's postseason.

Oral bacteria may be determined by environment, not genes, scientists say. That's different from other parts in the body, like the gut, where bacteria may be influenced by genome or immune system.

Since Leonardo Da Vinci drew up plans for an ornithopter in 1488, hundreds of engineers and inventors have pursued the dream of flight. A handful have succeeded.

The right to choose the school you want your child to attend has been the subject of court battles and bitter political debates. Still, both President Obama and Mitt Romney have made school choice a cornerstone of their efforts to reform public education.

Spain's dismal economy has residents of the country's richest region, Catalonia, wondering if they'd be better off going it alone. With their own language and distinct culture, Catalans have long pushed for independence from Spain.