Consider this quote from NYT:
Another indication of malleability is that I.Q. has risen sharply over time. Indeed, the average I.Q. of a person in 1917 would amount to only 73 on today’s I.Q. test. Half the population of 1917 would be considered mentally retarded by today’s measurements, Professor Nisbett says.
Full article here:
http://www.nytimes.com/2009/04/16/opinion/16kristof.html?partner=rss&emc=rss
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