Teachers often have to start the school year with a review of last year's lessons, because lazy summer afternoons lead to kids losing up to 22 percent of what they learned the previous year. This ... more 
Teachers often have to start the school year with a review of last year's lessons, because lazy summer afternoons lead to kids losing up to 22 percent of what they learned the previous year. This summer, many parents brought their children to the National Museum of Mathematics, where they could have fun while sharpening their skills. less 
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Mon, Sep 2, 2013 12:11 PM EDT