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Law and national security experts got together last weekend for a dogfight they call the Drone Smackdown. The contest, though tongue in cheek, still raised lots of questions about the proliferation of drones, the rules of combat and federal efforts to regulate them.

The nation's new conservative-led coalition is facing its first large-scale protests since taking office. Workers are outraged about spending cuts to social programs. But Greece won't get more bailout funds without the cuts.

Los Angeles closes down a 10-mile stretch of Interstate 405 for two days this weekend for demolition work on a bridge. Traffic jams didn't materialize last year during a similar closure. But there's a new concern this year: helicopters swarming overhead to watch the demolition work.

India's Supreme Court has temporarily banned tourism in core areas of the country's 41 tiger reserves. The unexpected and controversial ruling is aimed at protecting the last of India's 1,700 tigers.

Iranian President Mahmoud Ahmadinejad used his eighth appearance before the U.N. General Assembly to elaborate on his vision of a new world order and criticize what he calls the world's "hegemonic" and "expansionist" powers.

The singer was 84. The cause of death, his family says, was bladder cancer.

Criminals and cops looking to grab a slice of some tasty action are smuggling American cheese into Canada, according to the Canadian Broadcasting Corp. The American cheese costs far less than its Canadian competitors.

Given the unrest in the Middle East and meetings at the U.N., there's been a lot of campaign talk about foreign policy. Guest host Celeste Headlee takes a look at how each candidate is addressing issues in the Middle East and Africa. She speaks with the Hisham Melhem of Al Arabiya and Mvemba Phezo Dizolele of the Hoover Institution at Stanford.

There are a lot more older people with worn-out knees, and the rate at which those people get knees replaced has gone way up in the last 20 years, too.

Scientists have discovered that a mouse found in Africa can lose large patches of skin and then grow it back without scarring, perhaps as a way of escaping the clutches of a predator. It's a finding that challenges the conventional view that mammals have an extremely limited ability to replace injured body parts.