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Many schools and colleges train students and staff to lock doors, call police and stay put during shooting threats. But a growing number of schools are adopting the advice of security experts who say students should be taught when and how to fight back when confronted by a gunman.

Mitt Romney's claim is belied by a large and growing body of academic studies. Democrats pounced on the remarks, which came a day after the GOP presidential nominee's comments on abortion stirred controversy.

The Oglala Sioux tribe has accused Anheuser-Busch and Pabst, among others, of illegally selling millions of cans of beer a year to the residents of the Pine Ridge Indian Reservation, which is officially dry. Some argue beer makers aren't to blame and that addiction issues run deep.

Defense Secretary Leon Panetta told business leaders the Pentagon is developing capabilities to ward off attacks on the nation's infrastructure. He says foreign actors have already probed key systems that could cause damage and even death — and the Pentagon has a key role to play in stopping such efforts.

Ben Affleck's Argo, which is based on the declassified story of the CIA's mission to save six American diplomats trapped in Iran in 1979, is gripping, compelling and, at times, hilarious. But, as critic David Edelstein explains, the best parts of the "true" story are the parts that aren't true at all.

The 2012 Nobel Prize winners were announced this week, and research on stem cells, cloning, cell receptors and quantum optics took center stage. Experts discuss how the work of this year's Nobel laureates changed our understanding of our bodies, and the world around us.

Artist Julian Hoeber's "Demon Hill," now on view at the Harris Lieberman Gallery in New York City, is modelled after a roadside attraction called a "gravitational mystery spot" — where water runs uphill and gravity doesn't behave as expected. Science Friday talked to cognitive scientist Michael Landy about what happens to our perceptual system inside the exhibition.

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.

The first two debates of the 2012 election cycle have had stratospheric viewership on TV.