So, what of the bulk of the lesson? What comes sandwiched between the recaps and the deliberate practice? Of course, the teaching itself: the explanation. I’ve already written about the joys and benefits of reading in a lesson, and if you can have a subject expert write an excellent explanation that is read and shared by all students, that is fantastic. But the real magic of teaching comes in the teacher’s talk. For students to learn the best, teachers need to instruct them.