Teachers play an important role in shaping student's brains. The document discusses how brain research can help teachers understand how students learn best and make learning more effective and joyful. It emphasizes that bringing neuroscience into the classroom can help make it a foundation, rather than a passing fad, by making teachers literate about the brain and cautious in applying research. Key principles discussed include the importance of gaining student attention through novelty and meaning, linking new ideas to their past experiences, and creating an optimal level of emotion to facilitate learning and memory.