timesonline.co.uk/tol/news/uk/article697134.ece
"Professor Lynn, who caused controversy last year by claiming that men were more intelligent than women by about five IQ points on average, said that populations in the colder, more challenging environments of Northern Europe had developed larger brains than those in warmer climates further south. The average brain size in Northern and Central Europe is 1,320cc and in southeast Europe it is 1,312cc. "The early human beings in northerly areas had to survive during cold winters when there were no plant foods and they were forced to hunt big game,""
Maybe it was last 200 years of extraordynary natural seclection.
hehehe not only winters but also partitions, persecutions, Stalin, Hitler etc ... something like Jews (Ashkenazi Jews IQ is about 110 - 120) but we had only 200 years of additional natural selection, the weakest died from hunger, were killed etc... :)
Long live Poland !
We will see if it this stats are true or not... future will tell us.