Changes

The next day the students handed in their homeworks, and the following week the professor returned their graded papers.  He said that only one student had answered the difficult problem correctly.  That student was the one who had tried to explain it to the others, but they would not listen.   

The next day the students handed in their homeworks, and the following week the professor returned their graded papers.  He said that only one student had answered the difficult problem correctly.  That student was the one who had tried to explain it to the others, but they would not listen.   

The student having the correct answer had found it in a book not used by the other students.

The student having the correct answer had found it in the teacher's solution book.

== The Wall ==

== The Wall ==