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Key speakers Tuesday include New Jersey Gov. Chris Christie and Ann Romney, the wife of the GOP presidential nominee.

Ecologist and "natural security expert" Rafe Sagarin thinks our systems for dealing with natural disasters and terrorist attacks need to be updated. The best place to turn for advice? Other organisms.

The Obama campaign on Wednesday escalated its attack on Mitt Romney's business career, with Vice President Joe Biden scheduled to aggressively question how Romney's management of the private equity firm Bain Capital might translate into running the U.S. economy.

In the past 10 years, bucking bulls have become a major industry. The price of the best bloodlines can soar to a quarter of a million dollars, and competitions take place everywhere from Wyoming to Madison Square Garden.

China and Russia vetoed a U.N. resolution threatening sanctions against Syria unless it stops targeting and attacking civilians.

The young ensemble associated with the famed Cleveland Orchestra makes its first trip abroad.

Officials say the FBI didn't open a formal investigation into Wade Michael Page about six years ago because he didn't seem to be a threat.

Missouri's Claire McCaskill is one of the most embattled Senate Democrats in the country. Conservative outside groups have been running TV ads against her for months. Tuesday night, Missouri voters in the Republican primary chose Congressman Todd Akin to face McCaskill in the fall.

Social media has become a huge part of how people experience the web. So it's not surprising that Google's move to integrate "personal results" into its search results — drawing from the Google+ community — wasn't praised by the folks who run rival social networks.

Republican presidential hopeful Rick Perry has been aboard a bus touring Iowa hoping to score an upset in next Tuesday's caucuses. Perry spent Thursday trying to reverse the surge that challenger Rick Santorum has seen in a recent poll.