A high school English teacher has refused to grade two students' papers because they mentioned guns. Marshall Williams and Alex Wright, seniors at Denton High School in Dallas-Fort Worth, Texas, said the teacher, Dewey Christian, set an assignment to write a report about anything they wanted. Williams referenced a trip he had taken to the Fort Worth gun show, while Wright recounted a hunting trip, but both said the papers did not describe shooting guns. 'I said, "Me and my mum went to buy a gun" and as soon as he heard the word gun he told me to sit...