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By Mark Davis
The nation founders, the Lone Star State thrives
Topic - J. Deary
Scientists who hunt for "intelligence genes" used to think there were fewer than half a dozen of them.
Mr. Deary said that future studies probably will need to involve millions of people to detect the genetic effects.
The team wanted to find out "whether genetic differences that we could test on people's DNA could explain some of the reasons that people have different intelligence-test scores," Mr. Deary said in an email.