Manchester United's former manager Alex Ferguson. Latest research found that people who worked intellectually demanding jobs were smarter. Photo: AFP

Research shows that thinking hard pays off in later years

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Published: 9:45pm, 20 Nov, 2014

Updated: 4:44am, 21 Nov, 2014

Manchester United's former manager Alex Ferguson. Latest research found that people who worked intellectually demanding jobs were smarter. Photo: AFP

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