Reading A-Z resources organized into weekly content-based units and differentiated instruction options. Two inquisitive brothers, upon noticing the movement of air above a fire, use persistence and ingenuity to determine principles of flight. They believe they have discovered the answers, but will leading scientists of the day agree with them? Teachers can use this lesson to engage students in a discussion about character motivation. Use this Graphic Book with The Balloon Brothers at Level Z, Z1, or Z2. Graphic Book Lesson PlanUse of vocabulary lessons requires a subscription to VocabularyA-Z.com. You may unsubscribe at any time.