one of many experiments Dweck devised to reveal the crippling power of the fixed mindset, she gave relatively easy puzzles to fifth graders. They enjoyed them. She then gave the children harder puzzles. Some of the children suddenly lost interest and declined an offer to take the puzzles home. Others loved the harder puzzles even more than the easy ones. “Could you write down the name of these puzzles,” one child asked, “so my mom can buy me some more when these ones run out?” The difference between the two groups of children was not “puzzle-solving talent.” Even among equally adept children,
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