Napa, California, is the US' happiest city, and Hawaii its happiest state. That's the conclusion of a research study from the University of Vermont, on the basis of the content of 10 million geotagged tweets.
They don't buy a sports car or get Botox - but it appears that chimpanzees and orangutans can experience a mid-life crisis just as humans do.
We may be richer, but we're more miserable, according to an analysis of tweets over the last three years.
Seniors with a regular sex life are more likely to be happy than celibate oldies, according to new research.
Scientists have for the first time discovered a 'happiness gene', which works by regulating the transport of serotonin in the brain.
Where was I? Oh yes. Um, apparently people spend around half their waking hours thinking of things other than what's going on around them. And it doesn't even make them happy.
It seems your mother was completely wrong - money can buy you happiness, or at any rate satisfaction. But it doesn't necessarily help you enjoy yourself.
Technology makes people happy, and women benefit even more than men, according to a global study from the British Computer Society.
Facebook continues in its mission to monitor our wellbeing, expanding its Gross National Happiness Index (GNH) to Canada, the UK and Australia.