They started surveying them when they were at Harvard from what I understand. That is still quite a bit removed from their childhoods. In any case the point a

They started surveying them when they were at Harvard from what I understand. That is still quite a bit removed from their childhoods. In any case the point about correlation != causation stands. The information is interesting, but I find that too often with these studies a correlation is taken. A conclusion is then made on the basis of the correlation, and then the conclusion is stated as fact. Anecdotal evidence follows and that's the end of it. The thing that irritates me the most is that it's just taken as truth and rarely if ever do people investigate further. I'd just love to have a discussion about the data and the possible implications and other explanations for the same data with judgement left up to the reader.