Happiness is the key to success.

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The key to happiness is to dwell as little as possible on that downside.

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LONDON, England (CNN) -- The key to happiness, productivity and popularity at work has been revealed.

CNN: Helping yourself by helping others

Because social connections are a key (perhaps the key to happiness), the fact that Twitter technology connects people makes this effect even more intense.

FORBES: 8 Reasons Why Twitter Can Boost Your Happiness.

Do you agree that strong relationships are the key to happiness?

FORBES: The Key to Happiness: Strong Relationships

There is a common notion in the drug industry that bigger is necessarily better, and that securing more than 10% of the world market is the key to corporate happiness.

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She says CareerBliss finds each year that work-life balance is a key factor in determining employee happiness.

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The other key question: how much does happiness depend on the medals table?

BBC: Going for the happiness gold

One leaflet proclaimed "Your personality is the key to your future success and happiness" and urged people to take a free "personality test" at the Scientologist church on London's Tottenham Court Road.

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Music with a rapid tempo, and written in a major key, correlated precisely with the induction of happiness.

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Again, researchers found liberal use of swear words to be a key factor in a city's overall happiness score.

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