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Mitt Romney walloped his closest GOP rival Rick Santorum by about 20 percentage points in Tuesday's Arizona primary. Arizona was a winner-take-all contest so Romney came away with 29 delegates.

As the GOP primary race moves into March, we look at the candidates' prospects in the 10 Super Tuesday states, where a trove of 413 delegates are up for grabs. Already Mitt Romney and Rick Santorum are battling over Ohio, with its 43 delegates and Midwest bragging rights.

News Corp. said he was stepping down to focus on the company's international TV business.

The insect is so large — as big as a human hand — it's been dubbed a "tree lobster." Presumed extinct, some enterprising entomologists found them on a barren hunk of rock in the middle of the ocean.

Media baron Rupert Murdoch's son James, 39, is leaving his job as executive chairman of News Corp.'s newspaper arm, the company said Wednesday. He'll focus instead on the international TV business at the company, which has been embroiled in a scandal over phone and e-mail hacking in Britain.

Teenagers had more problems with thinking after concussion than children or adults, according to a new study. They had problems with working memory six months to a year after being injured.

The State Department said Wednesday that North Korea agreed to implement a moratorium on nuclear tests, long-range missile launches and nuclear activities including the enrichment of uranium. In return, the U.S. agreed to finalize details of a food aid package and other steps to improve bilateral ties.

Not everyone who relies on Google's products is concerned about pending privacy changes. Some don't care; others don't know the change is looming. But for those who are concerned, the idea that Feb. 29 is their last chance to change these settings seems to have lit the fire of urgency.

In southern California, Hollywood howls over "piracy" and is pushing for legislation. In the north, Silicon Valley cries foul over what it sees as restrictions on a free and open Internet. The most pressing issue for both may be the huge sums of money each stands to lose.

Abo Bakr described a scene of desperation, death and constant danger in the city of Homs.