The key to happiness is having Danish DNA, scientists have claimed.
Researchers who looked at data from 131 countries found that the closer a nation was genetically to the Danes, the happier its people were.
Denmark regularly tops world happiness scales, but researchers found that Danish birth was also associated with a specific version of a gene that influences brain levels of the mood chemical serotonin.

The University of Warwick study’s co-author, Professor Andrew Oswald, said: “The genetic make-up of Britons is quite similar to that of the Danes. There is significant Danish DNA in Britain’s genetic make-up because of the Viking invasions from the late 8th century onwards.
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