Specialists in early brain development believe that some video games can enhance a child's cognition and problem-solving ability. Children under three who learn to solve simple jigsaw puzzles show a marked propensity to read sooner than those who do not. What does the second sentence do?

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Specialists in early brain development believe that some video games can enhance a child's cognition and problem-solving ability. Children under three who learn to solve simple jigsaw puzzles show a marked propensity to read sooner than those who do not. What does the second sentence do?