An Iowa woman jokingly calls it "Satan's handiwork." A California mom says she's broken down in tears. A Pennsylvania parent says it "makes my blood boil." What could be so horrible? Grade-school math ...

An Iowa woman jokingly calls it "Satan's handiwork.'' A California mom says she's broken down in tears. A Pennsylvania parent says it "makes my blood boil.'' What could be so horrible? Grade-school ...