NOT a joke, but a sober article at the Times of London on blondeness in women as an evolutionary stategy in Paleolithic Europe.
” ….Frost attributes the rapid evolution to how they gathered food. In Africa there was less dependence on animals and women were able to collect fruit for themselves. In Europe, by contrast, food gathering was almost exclusively a male hunter’s preserve. The retreating ice sheets left behind a landscape of fertile soil with plenty of grass and moss for herbivorous animals to eat, but few plants edible for humans. Women therefore took on jobs such as building shelters and making clothes while the men went on hunting trips, where the death rate was high.
“The increase in competition for males led to rapid change as women struggled to evolve the most alluring qualities. Frost believes his theory is supported by studies which show blonde hair is an indicator for high oestrogen levels in women.”
From Steve Sailer (scroll down) who also has some theories why blondeness could be a disadvantage for male big game hunters, especially in sunny climes.