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Meghan McClain
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Grit: The Power of Passion and Perseverance, by Angela Duckworth

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It turns out that run time in the Treadmill Test at age twenty was a surprisingly reliable predictor of psychological adjustment throughout adulthood.
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Grit: The Power of Passion and Perseverance
Grit: The Power of Passion and Perseverance
by Angela Duckworth
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