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How much vitamin D is enough vitamin D? And when should you add supplements to the diet? Doctors still disagree on the specifics, but some studies suggest that more isn't always better.

Michelle Shephard has traveled to Guantanamo Bay, Cuba, more than two dozen times and has been following the stories of men who've been released from the U.S. detention center. She's the author of Guantanamo's Child and Decade of Fear: Reporting From Terrorism's Grey Zone.

Some critics are puzzled by Mitt Romney's opposition to the Affordable Care Act because the law is a close cousin of the measure he signed while governor of Massachusetts. But others counter that the private sector is best left to make the changes imposed by President Obama's signature achievement.

If you don't believe me, just ask Canada. They produce more oil than they can use — and they pay just as much as we do.

Golfers are used to hazards like sand traps, though rarely an obstacle as interesting as a shark. This week, at a golf course in Southern California, a 2-pound leopard shark was spotted on the 12th tee. It had apparently been dropped by an ocean bird flying overhead.

The Kentucky Supreme Court has opted to take up a challenge to Gov. Steve Beshear's decision to use excess funds from the state's charitable gaming…

The news is sure to be a hot topic on the campaign trail as President Obama and Republican challenger Mitt Romney push to the Nov. 6 election.

Activists say some civilians have been killed by gunfire, but that government forces are not attacking rebels from the sky so far today.

Witnesses say a man detonated a suicide vest outside a mosque, killing many civilians and police officers. It happened in part of the country normally thought to be safe, but where another attack this week left five police officers dead.

After decades of being malaria-free, Greece is seeing a spike in malaria cases. And it's showing up in communities where the disease has never been seen before. Fewer resources for mosquito control and medications are fueling the reappearance of the forgotten disease, health workers say.