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Chuck Hagel's resignation comes amid concern over the rise of ISIS, also known as the Islamic State, and a return of U.S. troops to Iraq. President Obama is announcing the move Monday morning.

The experimental NewLink vaccine is based on a harmless virus that has been genetically engineered to incorporate bits of the Ebola virus. Testing of the vaccine has begun in healthy volunteers.

More people will be driving and flying this Thanksgiving holiday weekend. Gasoline isn't the only thing that's cheaper. Turkey is too, along with its companions, stuffing and cranberries.

President Obama announced the defense secretary's resignation Monday morning. Chuck Hagel clashed with White House adviser Susan Rice on Syria policy, and he never made it into Obama's inner circle.

"No probable cause exists" to file any indictments against police Officer Darren Wilson, St. Louis County prosecuting attorney Robert McCulloch said Monday night.

There's not enough evidence that screening the general public for vitamin D deficiency helps reduce the risk of disease, the U.S. Preventive Services Task Force says.

Leading companies are keeping tight-lipped about what they're doing to protect customers from similar attacks that have hit Target, Home Depot and other major retailers.

A woman is thought to be spreading Ebola in a remote village. So health workers spend four hours trekking through the bush to track her down. By the time they make it, it's too late.

Attorney Benjamin Crump said the decision not to charge police officer Darren Wilson in the shooting death of 18-year-old Michael Brown showed the system is broken. The decision sparked protests.

The grand jury was presented with hours of testimony and thousands of pages of documents. Their job was to decide if there was enough probable cause to bring charges against officer Darren Wilson.