And in terms of efficiency, U.S. ranks 22 out of 27 countries

Endurance training cuts chances of falls, injuries, sports medicine doc says

Replacing performance anxiety with excitement helps you focus on the positive, study suggests

Replacing performance anxiety with excitement helps you focus on the positive, study suggests

U.S. Justice Department resists court order exempting nuns from Affordable Care Act birth control rule

Study found sleep problems arose when kids were put to bed at wrong time

Study also found increased odds of heart attack, mini-stroke in older adults years after infection

Even well-cleaned cribs were contaminated with bacteria that can cause illness, study found

Choices range from drugs to nasal sprays to acupuncture

Health experts say more research needed into the devices' safety and effectiveness as a quit-smoking tool