Mark Barnes explains how author/expert Mike Fisher reimagines teaching the Common Core, with his one-letter hack. Fisher replaces the "r" in "rigor", to completely change the climate of today's classrooms, even in a standardized world. Barnes wonders if it's possible to change other areas of teaching and learning by shifting the language in other trendy education words. He suggests that major change is possible if teachers work together to come up with other one-letter or one-word hacks. Share yours at #HackLearning on Twitter and at http://hacklearning.org.