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Study suggests good cheer may spread itself

LONDON (AP) -- When you're smiling, the whole world really does smile with you. A paper being published Friday in a British medical journal concludes that happiness is contagious - and that people pass on their good cheer even to total strangers. American researchers who tracked more than 4,700 people in Framingham, Mass., as part of a 20-year heart study also found the transferred happiness is good for up to a year....

Brain-injured troops face unclear long-term risks

WASHINGTON (AP) -- Many of the thousands of troops who suffered traumatic brain injuries in Iraq and Afghanistan are at risk of long-term health problems including depression and Alzheimer's-like dementia, but it's impossible to predict how high those risks are, researchers say....

Measles deaths drop worldwide, report estimates

ATLANTA (AP) -- Measles deaths worldwide declined dramatically to about 200,000 a year, continuing a successful trend, global health authorities reported Thursday....