They call it the marshmallow test. A researcher gives this choice to a 4-year-old: “I am leaving for a few minutes to run an errand and you can have this marshmallow while I am gone, but if you wait until I return, you can have two marshmallows.”

Researchers at Stanford University ran that test in the 1960s. A dozen years later, they restudied the same children and found that those who had grabbed the single marshmallow tended to be more troubled as adolescents. Astonishingly, the one-marshmallow kids also scored an average of 210 points less on SAT tests.

Daniel Goleman tells that tale in his new book, Emotional Intelligence, to illustrate the

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