Previous work has offered income, education, low levels of agricultural labour (which is replaced by more mentally stimulating jobs), climate (the challenge of surviving cold weather might provoke the evolutionof intelligence) and even distance from humanity's African homeland (novel environments could encourage greater intelligence) as explanations for national differences in IQ.
The players, wearing white championship T-shirts, spoke of the evolutionof an often-clumsy team that struggled to mesh and sometimes played out like a bad novel.