Can fart jokes save the reading souls of boys? You better hope so. 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. "It certainly should set off alarm bells," said the center's director, Jack Jennings. "It's a significant separation." Parents of reluctant readers complain that boys are forced to stick to stuffy required school lists that exclude nonfiction or silly subjects, or have teachers...