Researchers have attempted to create a happiness index based on books and newspaper clippings, with the words used in the text treated as a way to gauge public emotion over the last 200 years.
Researchers tested people with photos of genuine and fake emotions to find out if those with psychopathic traits could tell the difference.
Minnesota ranked highest in physical health, economic stability and quality of life, while last-place Louisiana suffered from poor health and high unemployment.
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Experts believe parents' success plays a part in how content a man is.
arch 20 is International Day of Happiness and, as they've done every year, the United Nations has published the World Happiness Report.
Famous figures from Oprah Winfrey to Michelle Obama give their two cents on happiness.
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Research shows that people become easily overwhelmed by choice. One scientist argues that choosing good friends could help.
From social media to advertising, happiness is everywhere you look. And it isn't healthy, suggests new research.
The United States is richer than ever, but GDP isn't everything.
Responses from 200,000 British people revealed that mental health and relationships affect happiness the most.