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This book cover provided by The Blue Sky Press/Scholastic shows the cover of "Captain Underpants and the Preposterous Plight of the Purple Potty People," by Dav Pilkey. Boys have lagged behind girls in reading achievement for more than 20 years, but the gender gap now exists in nearly every state and has widened to mammoth proportions _ as much as 10 percentage points in some, according to the Center on Education Policy. (AP Photo/The Blue Sky Press/Scholastic) NO SALES

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