If you facilitate groups on a regular basis (teachers, student leaders, workshop facilitators, corporate trainers, etc.) you need to invest in this book! I have read many of books like this throughout my 15 years of speaking and this one blows the rest out of the water! It is written specifically for teachers, but the learning principles are applicable across the board - particularly if your end goal is audience engagement, content retention and post-session behavior change!
Quantum Teaching: Orchestrating Student Success
Bobbi DePorter, Mark Reardon, Sarah Singer Nourie