Book excerpt: Professors love to lecture. They really do. But, is this the best way for students to learn? It turns out that the most effective teachers ask students questions...lots of questions. For many faculty seeking to innovate in their lecture hall, the interactive teaching strategy of Peer Instruction and Think-Pair-Share is to be a great first step toward revitalizing and reinvigorating astronomy classes. Written by two highly experienced astronomy educators, this no-nonsense book tells you exactly what to do to increase interactivity in your classroom and gives you the resources needed to become an excellent teacher that receives high course-evaluation reviews.