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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]How scientists have tackled this question is with twin studies.  From the WSJ:

"More than any other evidence, it was the study of twins that brought about this change. "Born Together—Reared Apart," a new book by Nancy L. Segal about the Minnesota study of Twins Reared Apart (Mistra), narrates the history of the shift. In 1979, Thomas Bouchard of the University of Minnesota came across a newspaper report about a set of Ohio twins, separated at birth, who had been reunited and proved to possess uncannily similar habits. Dr. Bouchard began to collect case histories of twins raised apart and to invite them to Minneapolis for study.

By 1990, he, Dr. Segal and other colleagues were ready to publish their results in Science magazine. By then they had measured the IQ of 48 pairs of monozygotic, or identical, twins, raised apart (MZA) and 40 pairs of such twins raised together (MZT). The MZA twins were 69% similar in IQ, compared with 88% for MZT twins, both far greater resemblances than for any other pairs of individuals, even siblings. Other variables than genetics, such as material possessions in the home, had little influence, nor was the degree of social contact between the twins in each pair associated with their similarity in IQ."

[/quote]

Yes, but. There is a third factor that is rarely considered (and extremely difficult to study)--the environment in utero. Not all of the 69% similarity is genes; some part of it is that they experienced similar gestational circumstances.[/quote]
Excellent point. 
If mom is mostly stressed vs relaxed, 
that makes a HUGE difference.[/quote]

zero evidence of this[/quote]

+1. Utter rubbish. My sister and I have possibly the most stressed mom in the world. (of course, that we have seen)She is a nightmare, always was, nothing was relaxed ever. Sister is genius and I fall into genius range, but not as high as her. And we are both highly educated. But, according to above pp we should be dumb as dirt.[/quote]

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