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Your article refers to “the current theory that high intelligence arises from the coating of brain cells with especially large amounts of the fatty substance called myelin.” As a person with multiple sclerosis, anything about myelin interests me greatly, yet I have never heard of this. Marion Leeds Carroll Arlington, Mass. For more, see Daniele […]

Essence of g

New efforts to probe the biology of intelligence stir up a long-running controversy over what mental tests actually measure.

Genghis Khan’s Legacy?

Genghis Kahn's military success 800 years ago may have spread a particular form of the Y chromosome, one he may have himself carried.