Jonah Lehrer gets to the moral of one of his favorite recent papers, “Deliberate Practice Spells Success: Why Grittier Competitors Triumph at the National Spelling Bee":

It doesn’t matter if one is looking at retention rates at West Point or teacher performance within Teach for America or success in the spelling bee: Factors like grit are often the most predictive variables of real world performance. Thomas Edison was right: even genius is mostly just perspiration.

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