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Grid operators constantly match what power plants are producing with what people and their TVs, microwaves and air conditioners need. But when the electricity comes from unpredictable sources, like wind or solar power, balancing the grid is a challenge, a new study finds.

Mississippi and Alabama hold Republican primaries Tuesday. The two Southern contests are crucial for former Pennsylvania Senator Rick Santorum and former House Speaker Newt Gingrich. They have been working to pry votes away from Mitt Romney.

Days of fighting on the border between Israel and the Gaza strip cotinues. Israeli airstrikes killed three more people Monday in Gaza, the Palestinian-held area. Israelis have been bombing, Palestinians have been firing rockets into Israel.

A Japanese doctor said he wanted people to see the beauty of his Ferrari, so he positioned a camera behind the driver's seat and zoomed away. The video shows him driving 77 mph — 52 miles over the speed limit. Angry viewers reported the driver to police.

At least a dozen, and as many as 45, killed in Syrian attack blamed on pro-government militia.

Taliban vow revenge for killing of civilians; oil imports drop, Syrian militiamen blamed in latest slaughter in Homs, and more.

President Obama's approval ratings have fallen as gas prices have risen. Mitt Romney has benefited from his well-planned strategy of collecting delegates whereever they're up for grabs. The most recent polls showed Romney tied or ahead in Alabama and Mississippi.

A U.S. soldier is in custody after he allegedly killed 16 Afghan villagers Sunday. The incident is one more blow to an already fragile relationship between the United States and Afghanistan. There are also questions of what the incident will do to the U.S.strategy in Afghanistan.

Aircraft carrier that served in hotspots, including the Cuban Missile Crisis, for more than five decades heads out on its final mission.

In February, President Obama signed an aviation bill requiring the FAA to make plans to integrate drones into American airspace. Brookings Institution senior fellow John Villasenor explains what these drones will be able to see — and how our privacy and national security may be affected.