UK Daily Mail
"...a new study has revealed a clear correlation between intelligence and childlessness - with cleverer women more likely to choose not to have a family.
The study, which was conducted by Satoshi Kanazawa, a researcher at the London School of Economics, found that a woman's urge to have children decreases by a quarter for every 15 extra IQ points.
...One in five 45-year-olds is childless, while among those with degrees, the figure rises to 43 per cent, suggesting that Kanazawa's findings are sound.
A social study, conducted by social scientist Dr Nattavudh Powdthavee of the University of York, revealed that the notion that happiness comes from having children is illusory and offers yet another clue to why so many clever women are rejecting motherhood...."