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Vice President Joe Biden and GOP vice presidential nominee Paul Ryan engaged in a memorable and highly combative debate Thursday night in Danville, Kentucky. It's the only time the two men, who occupy the second spots on their party's presidential tickets, will square off before the election.

The admission marked a reversal for Tokyo Electric Power Co., which had defended it preparedness before the 2011 tsunami.

After being airlifted to a military hospital, Malala was listed in "satisfactory" condition.

The defense secretary delivered a speech he said was a "clarion call" for Americans to take cyber threats seriously.

Vice President Joe Biden and Congressman Paul Ryan butted heads over everything from Middle East policy to abortion. Guest host Celeste Headlee talks style and substance with two former speechwriters: Paul Orzulak, who helped Biden prepare for last night's debate, and columnist Mary Kate Cary, who worked with the George H.W. Bush administration.

More jurisdictions are turning to gambling to plug budget holes, but some say the economic benefits are exaggerated.

Corning's Gorilla Glass isn't totally unbreakable, as anyone who's dropped a smartphone knows. But it's twice as durable as regular glass--at half the thickness. How do they do it? Dave Velasquez, director of marketing and commercial operations for Gorilla Glass, talks about the innovations that make this ultrastrong, ultralight glass possible.

Every August, the ozone hole begins to grow over Antarctica, reaching its maximum size by late September. But by the New Year, it's gone again. Russell Schnell, of NOAA's Earth System Research Laboratory, explains the weird forces behind the ozone hole's formation--and why, in recent years, an ozone hole has capped the Arctic too.

Curiosity scooped its first sample of Martian soil on Oct. 7, but activities were halted after a small, bright object — which NASA now says is likely a piece of plastic from the rover — was spotted on the ground. Mike Watkins, Curiosity's mission manager, provides an update.

Malarkey is "meaningless talk, nonsense." Vice President Biden said that's what GOP vice presidential nominee Paul Ryan was spreading. Where the word came from is a bit of a mystery.