From the moment of birth the average human being loses brain cells. They die at a rate that can accelerate to as many as 100,000 per day by age 60, and unlike other cells they are not replaced. That dismaying loss would seem to ensure a substantial decline in mental capacity by middle age. But Psychologist Jon Kangas, director of the University of Santa Clara Counseling Center, believes that despite the diminishing number of brain cells, IQ may actually increase with age. In a recent study, Kangas found that the IQs of 48 men and women in the San Francisco...
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