Actually, the preponderance of studies show an range of between 40% and 70% of intelligence being linked to genetics. But the truth is that there are no conclusive studies to answer that question.
But in Murray's case, ever wondered (or bothered to learn) if those "estimates" were EVER supported with objective data or research?
Of course not. That's not the goal of people like you.
But the FACT is that those were baseless assertions offered up (without solicitation) by Murray. When asked to support his claims, Murray refused to reply to multiple requests of his peers. He simply ignored them.
Yes, Murray and Rushton are an ignominious pair, for sure. People in academics know this, and understand why.
The Bell Curve has been condemned by journalists and social scientists who lack the expertise to evaluate it. Most of these are content to jump and down, and wave their arms shouting, "It's racist!" It's racist!"
Scientists who specialize in the scientific study of intelligence differences nearly always defend
The Bell Curve, even at risk to their careers.
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The Dana Foundation, "Pretending that Intelligence Doesn’t Matter," Published: July 1, 2000, Author: Linda S. Gottfredson, Ph.D.
What scientists studying intelligence have discovered, in essence, is that people differ greatly in intelligence and those differences affect our life chances. Our different IQs persist throughout our lives because we each inherit different versions of the genes for intelligence. These natural variations in mental capability make some degree of social inequality inevitable in a free society...
Reactions to
The Bell Curve ranged from high praise to low blows, but most journalists and academics who spoke publicly condemned it. Accused of promoting pseudoscience, the authors, Richard Herrnstein and Charles Murray, actually built their analyses on hard facts about intelli*gence—facts found in any good textbook on the subject.3 It was the critics themselves who tended to be spouting nonsense.
Dismayed by the media disinformation attending
The Bell Curve controversy, 52 prominent researchers from 34 universities and research centers published a
Wall Street Journal editorial page statement in 1994 called “Mainstream Science on Intelligence.” These scientists, the antithesis of ideologues, have published thousands of scientific articles and hundreds of books defining the frontiers of intelligence research. They include many recipients of coveted awards and many past presidents of major scientific associations. Appearing several months into the firestorm over
The Bell Curve, the joint statement simply recited the most settled facts in the field, facts that had been depicted over and over again in news and commen*tary as “controversial” or “discredited.” A second consensus statement appeared two years later in the form of an official task force report from the most pertinent scientific organization, the American Psychological Association. “Intelligence: Knowns and Unknowns” offered essentially the same portrait of mainstream scientific opinion on the nature, origins, and predictive value of intelligence. Both statements suggested that
The Bell Curve’s portrayal of intelligence was basically accurate.4 Neither statement had any discernible impact on media reporting.
Pretending that Intelligence Doesn’t Matter | Dana Foundation