Critical Thinking Skills
Remember that teens are almost adults. Giving them the reigns in their learning and allowing them some autonomy can be very beneficial. Allow them to question, draw their own conclusions, and grapple with issues without threat of punishment or disapproval for a “wrong answer.”
Many teens, when they hit on a subject or field of knowledge that interests them, will absorb a shocking amount of information on the subject. Make use of this. If there is a student who indicates that they know something on the subject you are speaking on, encourage them to contribute.
This makes learning a team effort, and not a monarchy.