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With gasoline prices on the rise and pressure mounting to make better use of domestic energy, natural gas vehicles are making a comeback. Climate change is also driving demand — natural gas produces 20 to 30 percent fewer carbon emissions than diesel.

The district of Baba Amr in the city of Homs had been the heart of the Syrian uprising, where mass protests turned into an armed resistance. Activists say government troops are combing the area, arresting any male over the age of 12.

The next big date in the Republican primary calendar is next week's Super Tuesday. But on the way, the candidates are making a brief layover in the state of Washington. The local Republican caucuses are Saturday morning, and for once they may mean something to the presidential race.

The presidential campaign of Rick Santorum is fuming over a decision by Michigan's Republican Party to give both the state's at-large delegates to state-wide winner Mitt Romney. Earlier guidance from the state party suggested that the two delegates would be allocated proportionally.

Five of the estimated 13 deaths from the tornadoes that pounded Illinois, Missouri and Tennessee on Wednesday happened on Brady Street in Harrisburg, Ill. Forecasters are warning that there could be tornadoes again today in some nearby states.

"I only wish I could have done more," Frank Hall said. I'm not a hero. Just a football coach and a study hall teacher." Three students were killed and two others were wounded. The suspect was a fellow student.

It would be easy not to have known Continental Airlines has been merged with United for two years. That will change Saturday when all operations and branding are combined under just United. Any hiccups could mean delays throughout the airline's system.

Obama told The Atlantic that he doesn't "bluff" as president of the U.S. when he says he's willing to use the military to stop Iran from gaining a nuclear weapon... Maryland became the eighth state to legalize gay marriage... Virginia approved a controversial anti-abortion bill requiring ultrasound which the governor says he will sign.

It will be appealed, but Ani Chopourian's judgment against a hospital where she worked is thought to be the largest in U.S. history for a single victim.

South Sudan gained independence in 2011, but it has been locked in a bitter conflict with its northern neighbor. Rep. Frank Wolf (R.-Va.) just returned from the area. He talks with host Michel Martin about what some observers are calling a humanitarian crisis, and what the U.S. can do to help.