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Page last updated at 09:07 GMT, Monday, 27 October 2008

Teen brainpower 'deteriorating'

The brainpower of clever teenagers has deteriorated dramatically, despite an increase in the number of pupils achieving top grades in exams, a study has shown. Professor Michael Shayer, who led the research, says the cognitive abilities of today's brightest 14-year-olds are level with those of 12-year-olds in 1976.

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