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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.

NASA's space shuttle Endeavour is on its last journey. It's being towed through the streets of Los Angeles on its way to a science museum. Endeavour is expected to take two days to make the trip, providing gawkers with plenty of chances to get a glimpse.

The U.S.-China economic relationship is under pressure again with allegations from the House Intelligence Committee that two top Chinese telecom firms are security threats. China responded by saying the report could damage relations with the U.S.

Publicist-turned-filmmaker Ava DuVernay's Middle of Nowhere follows an inmate's wife's struggle to start over. It's part of a larger, indie film movement that aims to expand the audience for black cinema by telling stories that are "emotionally resonant [to] all."

In October 1962, Nick Holonyak and colleagues at General Electric built the first practical light-emitting diode, or LED, that could emit visible light. Semiconductor LEDs are now a part of uncountable electronic devices. Holonyak discusses the invention, and his work since then.

More than nine months after dropping out of the race for the Republican nomination for president, Rep. Michele Bachmann is back on the campaign trail. But this time it's in her Minnesota congressional district, where she faces an underfunded but tough Democratic opponent.

Fact checkers have raised some flags about some of the claims the candidates made regarding Medicare. Ryan tried to insist that his Medicare plan is bipartisan, while Biden at one point may have confused Medicare with Medicaid.

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.

The Iron Curtain fell more than two decades ago, but one capital in Europe remains divided: Nicosia, in the tiny island-nation of Cyprus. A 1974 war between Cyprus and neighboring Turkey left the two ethnic populations on the island — Greek and Turkish Cypriots — separated and embittered.