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Investigators are now saying arson was not the likely cause of Monday's fire that brought down the 3,500-year-old tree. It's possible a lightning strike a week ago started smoldering inside the giant.

U.S. plans for sanctions on Iran are escalating what some analysts call a covert war between the two countries. Patrick Clawson, director of the Washington Institute's Iran Security Initiative, and Columbia University's Gary Sick discuss how the Obama administration should deal with Iran.

The British voice mail hacking and police bribery scandal has led to calls for government regulation of the press in one of the world's greatest democracies. Perhaps surprisingly, though, the boisterous British press already operates under more constraints than their U.S. counterparts.

Proponents of keeping the leap second say it's a philosophical question, about whether we want to stay in tune with the Earth's orbit.

Yang is leaving at a time when the Internet behemoth has struggled to remain relevant. Yahoo!'s stock price rallied on the news.

In South Carolina, the race to be the conservative alternative to Mitt Romney is hitting a fever pitch. The state's GOP primary is Saturday.

Old mattresses are among the worst kinds of household waste — recyclers don't want them, and neither do most landfills. A new business that started as a college project hopes to move mattress recycling into the mainstream, employing former convicts in the process.

Oil from the Canadian north is already making its way into the U.S. market through existing pipelines and tanker shipments. Energy experts say even if President Obama blocks the proposed Keystone XL pipeline, it may already be too late to stop Americans from relying on this dirty source of fuel.

Some of the survivors of last week's shipwreck off the Italian coast described the rescue effort as chaotic and disorganized. A maritime workers union called the disaster a "wake-up call" highlighting long-standing safety concerns — like ships getting too large to evacuate quickly — and lax regulation.