AP - Almost one in five young American adults has a personality disorder that interferes with everyday life, and even more abuse alcohol or drugs, researchers reported Monday in the most extensive study of its kind.

Delegates from about 190 countries opened a two-week conference in Poznan, Poland, which is aimed at nailing down the details of a climate change treaty to replace the 1997 Kyoto Protocol.

A new study says PET scans are one of the most effective tools in finding cancer.

AP - Older people who are depressed are much more likely to develop a dangerous type of internal body fat — the kind that can lead to diabetes and heart disease — than people who are not depressed, a disturbing new study found.

AP - Last warning: Asthma inhalers go "green" on Dec. 31, forcing patients still using the old-fashioned kind to make a pricey and even confusing switch. The medicine inside these rescue inhalers — the albuterol that quickly opens airways during an asthma attack — isn't changing. But the chemicals used to puff that drug into your lungs are.