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The District of Columbia Court of Appeals' decision overrides a July ruling by a three-judge panel that imperiled subsidies for people buying insurance in states that rely on the federal exchange.

People are getting the message about the dangers of secondhand smoke at home, a CDC study says. But half of smokers still light up in the house, putting the health of relatives and friends at risk.

What are the chances somebody with Ebola will fly to the U.S. by late September? One team of scientists says it could be as high as 18 percent. And the risk is even higher for the U.K.

Over the next six months, about 20,000 people will get Ebola. Half will likely die. To stop the virus, the World Health Organization says it needs thousands of health care workers and $600 million.

The diplomat violated a quarantine. The doctor became ill but still saw patients. Now Africa's most populous country is scrambling to find more than 200 people who could have Ebola.

There's nothing like an ambulance when you really need one, but they're expensive, and a lot of people who call an ambulance would actually be better served with a different, cheaper kind of care.

Vaccinations and therapeutics are being tested. Some could be available for use as early as November, if they prove to be safe.

Why does that sleek polyester T-shirt reek after 10 minutes, while the old-school cotton stays relatively sweet? Polyester attracts very different microbes, which may account for that special stink.

Pilots and flight attendants in some countries are classified as "radiation workers" because of their extra exposure to cosmic rays. Scientists say these frequent fliers may face greater risks.

Many students go to college expecting to drink, and all too often the college culture encourages it. That makes students more vulnerable to sexual assault, car accidents and other dangers.