We've all "caught" yawning from other people, but why that happens is unclear, according to a psychologist who has researched the behavior.
Where you live can have a major effect on your health, new research suggests.
As the number of Americans living with Alzheimer's disease continues to rise, the role of caregivers has become increasingly important, a dementia expert notes.
If current trends continue, nearly one-quarter of the world's population will be obese by 2045. And one in eight people will have type 2 diabetes, new research suggests.
If you want to look cool, try smiling, researchers suggest.