Arthur is a chauffeur who is intellectually gifted. Jonathan is no less bright than Arthur, equally hard-working, yet a billionaire. So why is Jonathan in the back seat of the limousine and Arthur in the front? What explains the difference between success and failure? Joachim de Posada found the answer in a Stanford University study of children who were able to delay gratification by not eating a marshmallow with the promise of receiving another one if they resisted eating the first for 15 minutes.
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