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achievement gap

According to a new study, among families in the middle socioeconomic group the older, September-born kids were 2.6 percentage points more likely to attend college and 2.6 percentage points more likely to graduate from an elite university. Rawpixel Ltd./Getty Images/iStockphoto hide caption

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Rawpixel Ltd./Getty Images/iStockphoto

Simple Number, Complex Impact: How Many Words Has A Child Heard?

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