History is so Opinionated

Mr Rang was your ordinary History Teacher, working hard to make his students achieve their best by giving them all the knowledge he can, reciting the words in the text books given to him from the old library's of the school and writing them on the board, except- wait a minuet...
"That wasn't in the textbook" the students would say, just loud enough for the teacher to pause his chalk on the board, smirk, and look up at the words as if reliving them.