"The study was lent some credibility by the finding that the Russians were the most unhappy"

I've always thought most unhappy people live in China, India, Pakistan and such...

The statement above shows that happiness is mostly depending on culture. I personally found Russian culture and way of perceiving the world too depressive.

You wont be happy if you just move to Iceland. Learning Icelander's style of world perceiving is necessary. Could you?