Average IQ in Hong Kong: 108
#1 on the World Ranking List
Why does Hong Kong have the highest IQ on average?
Some scientists think Hong Kong has a higher iodine diet than most other countries and this diet has quite a positive effect on mental ability and concentration and a very high influence on the IQ level.
Of course the education and medical level have an effect on IQ too. But the highest IQ doesn't make HK the happiest country - it ranks low (#71) on the Happiness Report which is super-low for a country as developed as HK.
So despite the fact that this country is considered to be sufficiently developed and educated, its inhabitants, unfortunately, do not feel happy themselves.
Average National IQs