It is interesting how nearly all of the 10 countries in the top 10 are either in North-Western Europe, or have historically been "sprung" from a country in Nort

It is interesting how nearly all of the 10 countries in the top 10 are either in North-Western Europe, or have historically been "sprung" from a country in North-Western Europe (e.g. Canada, Australia, New Zealand who are in the Commonwealth and still technically headed by Queen Elizabeth II). If you look deeper, the top 10 countries that are in North-Western Europe (Norway, Sweeden, Denmark, Finland, the Netherlands) are all under the heavy influence of the Gulf Stream which makes their climate particularly overcast, rainy and dreary - probably the most miserable in the world. So maybe it all comes down to the people of those countries learning ways to "keep themselves happy" over the centuries - an evolutionary technique of psychological survival, so to speak. Just a thought.