We used an approach called student centered learning at the University I lectured at. Basically, students sit in groups and work with each other and the lecture

We used an approach called student centered learning at the University I lectured at. Basically, students sit in groups and work with each other and the lecturer acts as an enabler (this is actually harder than just lecturing for 1+ hours). But considering we retain 90% of what we teach, I decided to have a team of students give a lecture. For QA, the team would come into my office and give me their lecture along with student centered learning tasks they created. They then lectured in the class. Other students were a lot more attentive and ask a lot more questions. The students who lectured really knew the material. In some cases, students would come to my office and ask if they could give another lecture. Later, I found out, a few students liked lecturing so much that they became teachers.